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-3(x-4y)+5(-3x+2y)+6x-y
-3x+12y-15x+10y+6x-y
-12x+21y
b)
10x-4(a-b)-13x+2(-3a+b)
10x-4a+4b-13x-6a+2b
-3x-10a+6b
c)
8x+3y+2(4x-2y)+6y+3x
-8x+3y+8x-4y+6y+3x
3x+5y
d)
11a-3(a+2b)+4(-2a-4b)+12b)
11a-3a-6b-8a-8b+12b
-2b