Solve for a
a=\frac{7-b}{5}
Solve for b
b=7-5a
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5a=7-b
Subtract b from both sides.
\frac{5a}{5}=\frac{7-b}{5}
Divide both sides by 5.
a=\frac{7-b}{5}
Dividing by 5 undoes the multiplication by 5.
b=7-5a
Subtract 5a from both sides.
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