Solve for b
b = \frac{13}{7} = 1\frac{6}{7} \approx 1.857142857
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3=\frac{8}{7}+b
Multiply \frac{1}{7} and 8 to get \frac{8}{7}.
\frac{8}{7}+b=3
Swap sides so that all variable terms are on the left hand side.
b=3-\frac{8}{7}
Subtract \frac{8}{7} from both sides.
b=\frac{21}{7}-\frac{8}{7}
Convert 3 to fraction \frac{21}{7}.
b=\frac{21-8}{7}
Since \frac{21}{7} and \frac{8}{7} have the same denominator, subtract them by subtracting their numerators.
b=\frac{13}{7}
Subtract 8 from 21 to get 13.
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