Solve for a
a=\frac{b}{3}
Solve for b
b=3a
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3a+3=3+b
Swap sides so that all variable terms are on the left hand side.
3a=3+b-3
Subtract 3 from both sides.
3a=b
Subtract 3 from 3 to get 0.
\frac{3a}{3}=\frac{b}{3}
Divide both sides by 3.
a=\frac{b}{3}
Dividing by 3 undoes the multiplication by 3.
b=3a+3-3
Subtract 3 from both sides.
b=3a
Subtract 3 from 3 to get 0.
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