factor each of the following expressions by grouping (x+2y) (2x+5) -(x+y) (2x+5)
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(x+2y)(2x+5)-(x+y)(2x+5)
=(2x+5)[(x+2y)-(x+y)]
=(2x+5)[x+2y-x-y]
=(2x+5)(y)
=5y+2xy
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