$-18x+9-23x$
$a^2+\:10a\:+25$
$\left(\frac{3m^3}{9n^2}\right)^5$
$\frac{sin2x}{cosx}+cosx$
$-3\left(3a\right)^2\left(-1\right)$
$4\int\left(\sec^2\left(x\right)\right)dx$
$3-\left(14-7\right)$
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