Solve for z
z=-\frac{v}{75000}+\frac{4}{5}
Solve for v
v=60000-75000z
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60000-75000z=v
Swap sides so that all variable terms are on the left hand side.
-75000z=v-60000
Subtract 60000 from both sides.
\frac{-75000z}{-75000}=\frac{v-60000}{-75000}
Divide both sides by -75000.
z=\frac{v-60000}{-75000}
Dividing by -75000 undoes the multiplication by -75000.
z=-\frac{v}{75000}+\frac{4}{5}
Divide v-60000 by -75000.
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