$\left(-6\right)\:+\:\left(-5\right)\:-\:\left(-7\right)\:+\:4$
$\left(2n^5\right)\frac{1}{6}$
$\frac{2a-6b}{\sqrt{a}+\sqrt{3}b}$
$49x^2+121+154x$
$\cos\left(x\right)\left(1+\frac{\tan\left(x\right)^2}{\sec\left(x\right)+1}\right)$
$\left(2x^{-3}y^2\right)^3\left(x^4y^5z^3\right)^4$
$9xy+27x+36y$
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