Solve for a
a=\frac{8b}{7}
Solve for b
b=\frac{7a}{8}
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7a=8b
Add 8b to both sides. Anything plus zero gives itself.
\frac{7a}{7}=\frac{8b}{7}
Divide both sides by 7.
a=\frac{8b}{7}
Dividing by 7 undoes the multiplication by 7.
-8b=-7a
Subtract 7a from both sides. Anything subtracted from zero gives its negation.
\frac{-8b}{-8}=-\frac{7a}{-8}
Divide both sides by -8.
b=-\frac{7a}{-8}
Dividing by -8 undoes the multiplication by -8.
b=\frac{7a}{8}
Divide -7a by -8.
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