Solve for b
b=3\left(a+20\right)
Solve for a
a=\frac{b-60}{3}
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\frac{b}{3}-20=a
Swap sides so that all variable terms are on the left hand side.
\frac{b}{3}=a+20
Add 20 to both sides.
b=3a+60
Multiply both sides of the equation by 3.
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