$\frac{3x^2-2x+1}{x+1}$
$\frac{x^{-1}\cdot x^{-7}}{x^{-1}}$
$-2^2-8x-2+1$
$\left(2t^2-t-4\right)$
$-5d+3\left(2d-7\right)$
$2\sqrt[2]{x-1}+2$
$\frac{tanx}{sec^2x\left(1-cos2x\right)}$
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