show step by step:
( 3x - 6y) + ( 2x + y)
(3x−6y)+(2x+y)( 3x - 6y) + ( 2x + y)(3x−6y)+(2x+y)
3x−6y+2x+y3x -6y+2x+y3x−6y+2x+y
3x+2x−6y+y3x +2x-6y+y3x+2x−6y+y
=5x -5y
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