$2x\:+\:7n\:+\:11x\:+\:3\:+5n$
$\left(m+n\right)\left(m^2+n^2-mn\right)$
$\left(x+1\right)^2-2\left(x+1\right)+1$
$2m=74.2$
$n-37=-42$
$2u^4-x^2-1=0$
$\int x^6\:\sin2x\:dx$
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