Solve for y
y=\frac{x-90}{2}
Solve for x
x=2\left(y+45\right)
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2y+90=x
Swap sides so that all variable terms are on the left hand side.
2y=x-90
Subtract 90 from both sides.
\frac{2y}{2}=\frac{x-90}{2}
Divide both sides by 2.
y=\frac{x-90}{2}
Dividing by 2 undoes the multiplication by 2.
y=\frac{x}{2}-45
Divide x-90 by 2.
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