$15+3^2-2\cdot7+\left(20-3\cdot4\right)$
$\lim_{x\to0}\left(\frac{2x^2-x-3}{x+1}\right)$
$-7+15-8+25-17-6-18+30+0$
$\int\left(\frac{x}{sqrt\left(x^2-9\right)}\right)dx$
$\:4x+2x-3m-6m+6\:\cdot$
$sin\left(-x\right).cos\left(x\right).sec\left(-x\right)$
$2\left(x+1\right)+2x-7$
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