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= 3a-5a-2b-5b+2c
= -2a-7b+2c
b.32xy+4x-2y+10yx-4x+2y (yx dikomutatifkan jadi xy)
=4x-4x+32xy+10xy-2y+2y
=42 xy
c.3x-3y-3x-4y
=3x-3x-3y-4y
=-7y