solve to simplify - (5x-3y-2)^2
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(5x-3y-2)^2
=(5x)^2+(-3y)^2+(-2)^2 +2*5x*-3y +2*-3y*-2 +2*(-2)*5x
=25x^2+9y^2+4-30xy+12y-20x
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