Factor
\left(1-k\right)\left(2r+1\right)
Evaluate
\left(1-k\right)\left(2r+1\right)
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2r+1-k\left(2r+1\right)
Do the grouping 1+2r-k-2kr=\left(1+2r\right)+\left(-k-2kr\right), and factor out -k in -k-2kr.
\left(2r+1\right)\left(1-k\right)
Factor out common term 2r+1 by using distributive property.
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