Question

How do you solve\[\dfrac{5}{9}x+3=\dfrac{2}{3}\]?

Answer 1

Hint: This is a linear equation in one variable as there is only one variable in an equation. In the given question, the variable is the letter ‘\[x\]’, to solve this question we need to get ‘\[x\]’ on one side of the “equals” sign, and all the other numbers on the other side. To solve this equation for a given variable ‘\[x\]’, we have to undo the mathematical operations such as addition, subtraction, multiplication and division that have been done to the variables.

Complete step by step solution:
We have the given equation;
\[\Rightarrow \dfrac{5}{9}x+3=\dfrac{2}{3}\]
Subtracting 3 from both sides of the above equation, we get
\[\Rightarrow \dfrac{5}{9}x+3-3=\dfrac{2}{3}-3\]
Simplifying the numbers in the above equation, we get
\[\Rightarrow \dfrac{5}{9}x=\dfrac{2}{3}-3\]
Simplifying the right side of the equation by taking LCM, we obtain
\[\Rightarrow \dfrac{5}{9}x=\dfrac{2}{3}-\dfrac{3\times 3}{1\times 3}\]
\[\Rightarrow \dfrac{5}{9}x=\dfrac{2}{3}-\dfrac{9}{3}\]
Simplifying the above, we get
\[\Rightarrow \dfrac{5}{9}x=-\dfrac{7}{3}\]
Multiply both the sides of the equation by 9, we get
\[\Rightarrow 5x=-\dfrac{7}{3}\times 9\]
\[\Rightarrow 5x=-\dfrac{63}{3}\]
Write the above equation in the simplest form, we get
\[\Rightarrow 5x=-21\]
Dividing both the side of the equation by 5, we get
\[\Rightarrow x=\dfrac{-21}{5}\]
Therefore, the possible value of \[x\] is \[\dfrac{-21}{5}\].
It is the required solution.

Note: Use addition or subtraction properties of equality to gather variable terms on one side of the equation and constant on the other side of the equation. The important thing to recollect about any equation is that the ‘equals’ sign represents a balance. Use the multiplication or division properties of equality to form the coefficient of the variable term equivalent to 1. This is the type of question where only mathematical operations such as addition, subtraction, multiplication and division is used.