$-4+x=-3$
$\frac{1}{1-sec\left(x\right)}-\frac{1}{1+sec\left(x\right)}=-2cot^2\left(x\right)$
$\left(7x-2\right)\left(x-5\right)$
$\left(8x^4-x+3\right)\left(-x^5+6\right)$
$\lim_{x\to0}\left(\frac{e^{x^2}}{x^4}\right)$
$5\cdot3-9$
$5xy^3-2xy^3+7x^3-3xy^3$
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