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Solve for a
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uz=-a+z
Multiply both sides of the equation by z.
-a+z=uz
Swap sides so that all variable terms are on the left hand side.
-a=uz-z
Subtract z from both sides.
\frac{-a}{-1}=\frac{z\left(u-1\right)}{-1}
Divide both sides by -1.
a=\frac{z\left(u-1\right)}{-1}
Dividing by -1 undoes the multiplication by -1.
a=z-uz
Divide z\left(-1+u\right) by -1.