$\frac{dn}{dt}=1000-n\cdot0.5$
$\left(4\right)^2+2\left(4\right)-1$
$6x+2x-15x-2m+11m$
$abx+3x-10ab-30$
$25.49\cdot31.3$
$2x^2-x+5x^2-7x^2+6x-10x$
$9\:+\:9n\:=\:7n\:-\:1$
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