Упростить выражения: а) (x+2)^3-(x-1)^3-(3x-1)^2; б) (6х+5)^2 - (4x+5)^2;
в) (2х - 3у)^2 - (5x+7y)^2; г) (3a+2b)^2 - (7a-6b)^2
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