$12x-18=18$
$\left[-18\:+\:\left(-3+5-7\right).\:\left(-4\right)\:-\:\left(-5+6\right)\::\:\left(-1\right)\right]$
$6c-2m\:+9c\:+5m$
$\sqrt{4x^2y}$
$2n^3-8n^2+4n$
$x^2-10xy$
$\int\:\frac{4x-1}{x^2\left(x+1\right)^2}dx$
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