a)2x(x-3)=(x-1)(2x+4)b)(2x+1)(2x-1)=2(x-1)(2x+3)c)(x-2)^2+3x(x-2)d)2/x-3 - 1/x(x+3)=3/x2/x+3 - 3/3-x =X/x^2-9
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