# How do you solve 1/2 x = 40?

May 21, 2015

Consider that you can move $\frac{1}{2}$ to the right of your expression (but inverting it) as:
$x = \left(\frac{2}{1}\right) 40$
So that $x = 40 \cdot 2 = 80$
Remember that your equation is like a balance; everything you move from one side to the other (of the equal sign) must change sign. In this case on the left you had a division by $2$...it goes to the right as a multiplication by $2$.
:-)