Solve for a
a=\frac{5-b}{3}
Solve for b
b=5-3a
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3a=5-b
Subtract b from both sides.
\frac{3a}{3}=\frac{5-b}{3}
Divide both sides by 3.
a=\frac{5-b}{3}
Dividing by 3 undoes the multiplication by 3.
b=5-3a
Subtract 3a from both sides.
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