Solve for x
x=\frac{d-402}{10}
Solve for d
d=10x+402
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10x+402=d
Swap sides so that all variable terms are on the left hand side.
10x=d-402
Subtract 402 from both sides.
\frac{10x}{10}=\frac{d-402}{10}
Divide both sides by 10.
x=\frac{d-402}{10}
Dividing by 10 undoes the multiplication by 10.
x=\frac{d}{10}-\frac{201}{5}
Divide d-402 by 10.
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