$-7+6c>21$
$\left(+5\right)\left(-2\right)\left(-5\right)\left(-7\right)$
$\frac{\left(4a+10\right)}{3b-5};\:a=-3;\:b=4$
$\frac{1}{sec^2x-1}$
$\left(j+8\right)\cdot\left(x+12\right)$
$\lim_{x\to0}\left(\frac{x^2-1-\ln\left(x\right)}{\left(\ln\left(x\right)\right)\cdot\left(x^2-1\right)}\right)$
$\lim_{x\to0}\left(\sqrt[3]{\left(x^3-3x^2\right)}-x\right)$
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