3 (x square - 5 x) square - 2 (x square - 5 x + 5) minus 6
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= 3x^2-15x^2-(2x^2-10x+10)-6
=3x^2-15x^2-(2x^2)-6 (-10x)-6 (+10)-6
=Answer=3x^2-15x^2-8x^2-16+4
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