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b) (2a-b+1)-(-3b+2a)+(3b-a+3)=-a+5b+4
a) -3(5-a)+2(2a-2)-20a=-15+3a+4a-4-20a=-19-13a
b) -2(3x-1)+4(x-3)-12x=-6x+2+4x-12-12x=-14x-14
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