Question

In the algebraic expression, $8x+7=70+x$, the value of unknown is

• A. 8
• B. 9
• C. 10
• D. 11

Answer 1

The correct option is B 9

Given, $8x+7=70+x$
We need to solve $x$ by isolating it on one side of the equation.

Step 1: Collect all variable terms on one side of the equation.
$8x+7=70+x$

So, subtract $x$ on both sides of the equation
$\Rightarrow 8x-x+7=70+x-x$
$\Rightarrow 7x+7=70$

Step 2: Collect constant terms on other side of the equation by subtracting 7 from both the sides.
$\Rightarrow 7x+7-7=70-7\Rightarrow 7x=63$

Step 3: Make the coefficient of the variable term equal to 1 by dividing from 7 on both the sides.
$\Rightarrow \frac{7x}{7}=\frac{63}{7}\Rightarrow x=9$

Hence, $x=9$