$6m-9n+21nx-14mx$
$-2=-13$
$\frac{-3x}{2x^2+10x+12}$
$\frac{4x-1}{x\left(x^2+2\right)^2}$
$\int_3^7\left(-4x+x^3\right)dx$
$\frac{\tan\left(x\right)}{\cot\left(x\right)}-\frac{\cot\left(x\right)}{\tan\left(x\right)}$
$5x^2-7x\left(3x-8\right)+3x^2-8x+3$
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