Solve for a
a=-\frac{x}{2}+150
Solve for x
x=300-2a
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-2a=x-300
Subtract 300 from both sides.
\frac{-2a}{-2}=\frac{x-300}{-2}
Divide both sides by -2.
a=\frac{x-300}{-2}
Dividing by -2 undoes the multiplication by -2.
a=-\frac{x}{2}+150
Divide x-300 by -2.
x=300-2a
Swap sides so that all variable terms are on the left hand side.
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