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b) -2(3a-2b)-4a(2-3a+2b)= -6a+4b-8a+12a²-8ab=12a²-8ab-14a+4b
c) (4-x)(2x+5)-4=3x-2x²+20-4=-2x²+3x+16
d) (4-2x)(3x-3)-2x(3x+1)= 18x-6x²-12-6x²-2x=-12x²+16x-12
b] -2(3a-2b)-4a(2-3a+2b)= -6a+4b-8a+12a²-8ab=12a²-8ab-14a+4b
c] (4-x) (2x+5)-4= 3x-2x²+20-4= -2x²+3x+16
d] (4-2x) (3x-3) -2x(3x+1)= 18x-6x²-12-6x²-2x= -12x²+16x-12
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