$121x^2+66x-7$
$\int^7\left(\frac{3}{x^2}-1\right)dx$
$\sqrt{120x}$
$\left(-10+8-4\right)\cdot\left(+6-9-7\right)\cdot\left(-20-\left(-30\right)\right)$
$-2^2\left(3-2\right)-\left(3\right)\left(-2+2\right)+3\left(3\right)^2$
$\frac{\cos\left(x\right)\cdot\tan^2\left(x\right)}{1+\cos\left(x\right)}$
$13+7x-10y-5$
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