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a). 5(2x-1)+3(x-1)-6(7x-12)=15(8-x)-84

b). 2(3x+4)-3x+2=6(2x+3)+2(3-4x)+5(2x-3)

c). 4(9x-4)+2(2x-7)-7=3(3x+10)+5(x-22)-4