$10b-80ab^2$
$4\:.\:4\left(\left(-4\right):\left(-2\right)\right)+2\:.\:\left(8-5\right)$
$\cos\left(2x-90\right)=-1$
$300\left(-200p+996.5\right)$
$\left(-12\right)-\left(-11\right)-\left(-10\right)-\left(-3\right)$
$2=\log\left(x\right)+\log\left(x-21\right)$
$ydx+\left(x^2+1\right)dy=0$
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