Solve for b
b=\frac{a-6}{2}
Solve for a
a=2\left(b+3\right)
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-2b=6-a
Subtract a from both sides.
\frac{-2b}{-2}=\frac{6-a}{-2}
Divide both sides by -2.
b=\frac{6-a}{-2}
Dividing by -2 undoes the multiplication by -2.
b=\frac{a}{2}-3
Divide 6-a by -2.
a=6+2b
Add 2b to both sides.
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