$\left(3-8\right)+5^2$
$4x^2+2x-2$
$5x^2-y^3=-7$
$\frac{4x^2+4x+7}{x^2+1}$
$4^3\cdot2^{-3}\cdot8$
$3ab-5ab+7a$
$\lim_{x\to3}\left(\frac{x^2-2x+1}{x-3}\right)$
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