$-13x<26$
$\left(4x^3-9x+8\right)+\left(5x^3+3\right)$
$\int\frac{\left(9x+7\right)}{e^x}dx$
$\sqrt{2-x}=x$
$f^2+7f+1$
$2x^8+8x^2-12$
$-3\left(3x-2\right)+4x=5-2\left(x-2\right)$
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