$3m^{2}n+2mn-n:3mn-4n-2\text{restar}3m^{2}n+5mn$
$\frac{84}{2}$
$3n\:+\:\left(-5\right)\:+\:\left(-4n\right)\:+\:\left(-3\right)$
$\ln\left(40\right)-0.834$
$\frac{3x^2+2x+3}{x+1}$
$-4\left(-2r+5\right)$
$\int_1^{\infty}\left(\frac{1}{x^2+\:5}\right)dx$
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