$5\left(3a+4\left(2b-3c\right)+\left(-3\right)\left(a+4b\right)\right)$
$108-234-16$
$x^2+10x+5=0$
$\frac{\sqrt{y}}{4+\sqrt{y}}$
$-\left(\frac{16}{-8}\right)+6-15$
$2\cdot\left(-7\right)+2\cdot\left(-13\right)$
$x^2-5x\le-15$
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