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b) -5x+153x - 6x = 142
c) 4x-5y+3x+2y-5x = 4x+3x-5x-5y+2y
=2x-3y
d) 3(x-2y) -2(x+4y)-6x=3x-6y-2x-8y-6x
=3x-2x-6x-6y-8y
=-5x-14y
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