Only Use addition or subtraction if the unknown variable is alone and not combined with a Number .
<u><em>EXPLANATION :</em></u>
Given step 1 to be =
4x = 28
Following the third law,
The correct solution would have been
Divide both sides of the equation by 4
x = 7
Step-by-step explanation:
"A General Rule for Solving Equations
Simplify each side of the equation by removing parentheses and combining like terms.
Use addition or subtraction to isolate the variable term on one side of the equation.( Note : This law can only be applies if the variable is alone e.g x and not combined e.g 4x)
Use multiplication or division to solve for the variable" ( If variable is combined . Example : 4x