$x^2+6x-55$
$6n^4\:-\:12n^2\:+\:6$
$3000+500+\left(-250\right)+400$
$\frac{x}{2}+\frac{x+1}{7}<x-2$
$\lim_{x\to0}\left(\frac{7^x-3^x}{1-cos\sqrt{x}}\right)$
$-134\left(-412\right)$
$3\cdot\left|2+5\cdot\left(18-13\right)\right|-\left(7-5\right)\cdot\left|22-4\cdot\left(5\cdot6-9\cdot3\right)\right|$
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