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Simplify (4x^3+13x-7) -(6x^2+9x+2)

User Matthieun
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(4x^(3)+13x-7)-(6x^(2)+9x+2)\\\\=4x^(3)+13x-7-6x^(2)-9x-2\\\\=4x^(3)-6x^(2)+(13-9)x+(-7-2)\\\\=4x^(3)-6x^(2)+4x-9
User Sjmartin
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