$3x>900$
$3-2^2-1\cdot3$
$x-y=8$
$-7\cdot\left(-18+16\right)-\left(-17+2\right):3-\left(-14+22\right):\left(-2\right)-\left(-32+37\right)\cdot5$
$\frac{dy}{dx}=\frac{4y+2x}{3y+3x}$
$x^2+x+30=0$
$\int\frac{z^2}{\sqrt{9-z^2}}dz$
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