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Solve for Q
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Solve for S
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Q+T-S=r
Swap sides so that all variable terms are on the left hand side.
Q-S=r-T
Subtract T from both sides.
Q=r-T+S
Add S to both sides.
Q+T-S=r
Swap sides so that all variable terms are on the left hand side.
T-S=r-Q
Subtract Q from both sides.
-S=r-Q-T
Subtract T from both sides.
\frac{-S}{-1}=\frac{r-Q-T}{-1}
Divide both sides by -1.
S=\frac{r-Q-T}{-1}
Dividing by -1 undoes the multiplication by -1.
S=T+Q-r
Divide r-Q-T by -1.