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b)2(7x+5)-6(x-2) = 14x+10-6x+12= 8x+22
c)-2x(8-x)-5(x²+3x)=-16x+4x²- 5x²-15x= -31x-x²
d)5(3-2x)-(4x+6)*3= 15-10x-4x-6= 9-14x