$x-15=15-x$
$2\:+\:cos\:2x=\:3\:cosx$
$\left(-7\right)^3\left(-7\right)^1\left(-7\right)^3$
$-519+\left(-9782\right)$
$\frac{1}{2}\int\left(6^{3x+4}\right)dx$
$\frac{x^4+2x^3-10x}{x-3}$
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