$\ln\left(\sqrt{e^{3x}}\right)$
$-7\left(k\:-\:8\right)\:+\:2k$
$15ax+25bx+30cx$
$2m+n;m=-2\:;\:n=7$
$49x^2-9$
$\frac{15}{7.5}\:\frac{6}{5x+7}$
$68=4x$
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