Solve for x
x=\frac{y-z}{200}
Solve for y
y=200x+z
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200x=y-z
Subtract z from both sides.
\frac{200x}{200}=\frac{y-z}{200}
Divide both sides by 200.
x=\frac{y-z}{200}
Dividing by 200 undoes the multiplication by 200.
y=200x+z
Swap sides so that all variable terms are on the left hand side.
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