Solve for x
x=\frac{y-16000}{800}
Solve for y
y=800\left(x+20\right)
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800x+16000=y
Swap sides so that all variable terms are on the left hand side.
800x=y-16000
Subtract 16000 from both sides.
\frac{800x}{800}=\frac{y-16000}{800}
Divide both sides by 800.
x=\frac{y-16000}{800}
Dividing by 800 undoes the multiplication by 800.
x=\frac{y}{800}-20
Divide y-16000 by 800.
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