$64-\left(-11+2\right)+\left|-5\left(-5\right)\right|$
$\lim_{x\to0}\left(\frac{5x^3+8x^2}{3x^4-2x^2}\right)$
$2i^2$
$3y-5x+7y+1x$
$4x^6-28x^4$
$\int7x^3\:e^{-3x}dx$
$\left(2x^2-2\cdot\:\left(\frac{12}{2}\right)x+\left(\frac{12}{2}\right)^2\right)$
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