$\left(-a+3\right)^3$
$-4\left(k-7\right)+2k-7$
$\left(-123\right)+\left(-547\right)-\left(123\right)$
$3x^2y^2+9x^2y^2-18xy^2$
$\lim_{x\to20}\left(\frac{10lnx-10}{x-e}\right)$
$\frac{1}{x-1}>1$
$2-cos^2x$
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