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b) (3/4x-2)(1/2x-1/4) = 3/8x - 3/16x-1/x+ 1/2 = 6/16x - 3/16x-16/16x + 1/2 = -13/16x + 1/2
c) (3-x)(2-3x)-(2-5x)(3+2x) = (6-9x-2x+3x2)-(6+4x-15x-10x2)= 6-9x-2x+3x2-6-4x+15x+10x2= 13x2