Solve for b
b=\frac{9-a}{10}
Solve for a
a=9-10b
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10b=9-a
Subtract a from both sides.
\frac{10b}{10}=\frac{9-a}{10}
Divide both sides by 10.
b=\frac{9-a}{10}
Dividing by 10 undoes the multiplication by 10.
a=9-10b
Subtract 10b from both sides.
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