SOLUTION: factor by grouping. pv-pw-qv+qw=?

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Question 997113: factor by grouping.
pv-pw-qv+qw=?
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
pv - pw - qv + qw = p*(v-w) - q*(v-w) = (p-q)*(v-w).