Factor
\left(1-b\right)\left(4a-1\right)
Evaluate
\left(1-b\right)\left(4a-1\right)
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4a-1-b\left(4a-1\right)
Do the grouping 4a-1-4ab+b=\left(4a-1\right)+\left(-4ab+b\right), and factor out -b in -4ab+b.
\left(4a-1\right)\left(1-b\right)
Factor out common term 4a-1 by using distributive property.
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