$\left(a+4\right)\left(a-15\right)$
$\left(5n-7\right)^3$
$\lim_{x\to\infty}\left(\frac{4}{x^2-4}-\frac{1}{x-2}\right)$
$\frac{dy}{dx}=\frac{\left(-3+y\right)}{\left(-xy\right)}$
$\:\left(-12\right)\left\{45+6\left(-12\right)-\left(-3\left(6\right)+9\right)\left[24-\left(-5\right)\left(-4\right)\right]\right\}$
$20+2\left(3x+10\right)=2x-3\left(3+x\right)$
$120\cdot28.6$
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