Simplify: (5x3−2x2+x)+(−3x3+4x2−7x)(5x^3 - 2x^2 + x) + (-3x^3 + 4x^2 - 7x)(5x3−2x2+x)+(−3x3+4x2−7x).
2x3+2x2−6x2x^3 + 2x^2 - 6x2x3+2x2−6x
8x3−6x2+8x8x^3 - 6x^2 + 8x8x3−6x2+8x
2x3−6x2−6x2x^3 - 6x^2 - 6x2x3−6x2−6x
2x3+2x2+8x2x^3 + 2x^2 + 8x2x3+2x2+8x