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\frac{b+3}{7}
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\frac{b+3}{7}
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\frac{\left(b+3\right)\left(20b+70\right)}{\left(20b+70\right)\times 7}
Divide \frac{b+3}{20b+70} by \frac{7}{20b+70} by multiplying \frac{b+3}{20b+70} by the reciprocal of \frac{7}{20b+70}.
\frac{b+3}{7}
Cancel out 20b+70 in both numerator and denominator.
\frac{\left(b+3\right)\left(20b+70\right)}{\left(20b+70\right)\times 7}
Divide \frac{b+3}{20b+70} by \frac{7}{20b+70} by multiplying \frac{b+3}{20b+70} by the reciprocal of \frac{7}{20b+70}.
\frac{b+3}{7}
Cancel out 20b+70 in both numerator and denominator.
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