Evaluate
-\frac{ab}{2}+a-8b
Factor
\frac{-ab+2a-16b}{2}
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a-\frac{1}{2}ba-8b
Divide 2b by 4 to get \frac{1}{2}b.
\frac{2a-ba-16b}{2}
Factor out \frac{1}{2}.
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