$3\:.\:\left(-3\right)\:-\:\left(-3\right)$
$3-\sqrt{64}\cdot\left(-7\right)+5\cdot\left(-2\right)^3$
$2x\cdot5m$
$1.11+1$
$\sqrt{\left(3x^2+1\right)^2}$
$\frac{dy}{dx}=\:\frac{x}{y}$
$6xy+10xz$
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