(3x+2y)^2-6(3x-2y)-72
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(3x+2y)^2-6(3x-2y)-72
=9x^2+4y^2+12xy-18x+12y-72
=9x^2-18x+4y^2+12y+12xy-72
=9x(x-2)+4y(y+3)+12xy-72
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