Solve for x
x=-\frac{y}{15000}+6
Solve for y
y=90000-15000x
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-15000x+90000=y
Swap sides so that all variable terms are on the left hand side.
-15000x=y-90000
Subtract 90000 from both sides.
\frac{-15000x}{-15000}=\frac{y-90000}{-15000}
Divide both sides by -15000.
x=\frac{y-90000}{-15000}
Dividing by -15000 undoes the multiplication by -15000.
x=-\frac{y}{15000}+6
Divide y-90000 by -15000.
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