Solve for y
y=\frac{b-12}{2}
Solve for b
b=2\left(y+6\right)
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-2y=12-b
Subtract b from both sides.
\frac{-2y}{-2}=\frac{12-b}{-2}
Divide both sides by -2.
y=\frac{12-b}{-2}
Dividing by -2 undoes the multiplication by -2.
y=\frac{b}{2}-6
Divide 12-b by -2.
b=12+2y
Add 2y to both sides.
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