Solve for b
b=rx+tx-d
Solve for d
d=rx+tx-b
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-b=d-rx-tx
Subtract tx from both sides.
-b=d-tx-rx
The equation is in standard form.
\frac{-b}{-1}=\frac{d-tx-rx}{-1}
Divide both sides by -1.
b=\frac{d-tx-rx}{-1}
Dividing by -1 undoes the multiplication by -1.
b=rx+tx-d
Divide d-rx-tx by -1.
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