Question

A=2(l+w) solve for w

Answer 1

Solving an equation means finding a value of a variable that make the equation true. This value is called the solution of the equation. A mathematical equation is just like a balanced equation. Both sides of the equation should be equal at all times. Whatever we do to one side, has to be done on the opposite side.

$A=2(l+w)$ 

$\dfrac{a}{2}=l+w$   $Divide \ both \ sides \ by \ 2$ 

$\dfrac{a}{2}-l=w$    $Subtract \ l \ from \ both \ sides$ 

$w= \dfrac{a}{2}-l$