Simplify 7x^3+8x^3-(4x+3y)(16x^2-12xy+9y^2)
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7x^3 + 8y^3 - (4x+3y)(16x^2-12xy+ 9y^2) = 7x^3 + 8y^3 - [ 64x^3 - 48x^2y + 36xy^2 + 48x^2y - 36xy^2 + 27y^3] = 7x^3 + 8y^3 - [ 64x^3 + 27y^3] = 7x^3 + 8y^3 - 64x^3 - 27y^3 = - (57x^3 + 19y^3)
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