Solve for x
x=\frac{S-57}{18}
Solve for S
S=18x+57
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-18x=57-S
Subtract S from both sides.
\frac{-18x}{-18}=\frac{57-S}{-18}
Divide both sides by -18.
x=\frac{57-S}{-18}
Dividing by -18 undoes the multiplication by -18.
x=\frac{S}{18}-\frac{19}{6}
Divide 57-S by -18.
S=57+18x
Add 18x to both sides.
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