$-5-\:\left(-1\right)$
$67-\infty$
$3a^2+9ab+5-4a^2-4ab+3$
$\left(-8x^{10}y^9\right)^2$
$\frac{1}{2\:}x\:-\:\left\{0,5\:-\:\left[0,25x\:-\:\left(\frac{1}{4}\:+\:x\right)\right]\right\}$
$2y'\:=\:y\left(2-y\right)$
$\sqrt{83.91}$
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