Question

The following steps are followed to solve the equation.
Step 1: $5x+7x-4x+2=5$
Step 2: $12x-4x=3$
Step 3: $8x=3$
Step 4: $x=3\times 8$
Which one is the wrong step?

• A. Step 1
• B. Step 2
• C. Step 3
• D. Step 4

Answer 1

The correct option is D Step 4

The equation is,
$5x+7x-4x+2=5$.

The correct steps to solve the equation is as follows:
$5x+7x-4x+2=5\Rightarrow 12x-4x=5-2\Rightarrow 8x=3\Rightarrow x=\frac{3}{8}$

Hence, the fourth step is the wrong one.