$30x+25=-9x^2$
$\left(2-5\right)-\left|\left(5-2\right)-\left(7-5\right)\right|$
$\lim_{x\to0}\left(-3sin\left(x\right)\right)$
$\frac{3x^2\cdot\left(-4x^3\right)}{16x^2}$
$x^2+6x-18<=0$
$c\left(x\right)=2x-3+\frac{2000}{x}$
$x^4-64.8x^2+172.8x=0$
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