Evaluate
-\frac{b}{7}+a
Factor
\frac{7a-b}{7}
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1a-\frac{b}{1}\times \frac{1}{7}
Divide 1 by 1 to get 1.
1a-b\times \frac{1}{7}
Anything divided by one gives itself.
1a-\frac{1}{7}b
Multiply -1 and \frac{1}{7} to get -\frac{1}{7}.
a-\frac{1}{7}b
For any term t, t\times 1=t and 1t=t.
\frac{7a-b}{7}
Factor out \frac{1}{7}.
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