Solve for c_y
c_{y}=\frac{7x-s}{2}
Solve for s
s=7x-2c_{y}
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2c_{y}=7x-s
Subtract s from both sides.
\frac{2c_{y}}{2}=\frac{7x-s}{2}
Divide both sides by 2.
c_{y}=\frac{7x-s}{2}
Dividing by 2 undoes the multiplication by 2.
s=7x-2c_{y}
Subtract 2c_{y} from both sides.
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