$\left(-5\right)\:+\:\left(+5\right)\:x\:2\::\:\left(-5\right)$
$2.6r\:+\:1.3\:=\:-16.9$
$5x\:-\:4\:+\:x$
$\sqrt{31}\cdot\sqrt{10}$
$5.7\cdot3.9$
$\frac{dy}{dx}=\left(\left(2x+3\right)\left(y-1\right)\right)$
$3,457+12,678$
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