$5:-2$
$\:3\left(-2\right)\:+3\left[\:2-\left(-1\right)2\right]-2$
$-4-7\cdot\left(1-3\right)$
$\frac{707.2}{\cos\left(x\right)}=\frac{108.93}{\sin\left(x\right)}$
$8 x ^ { 3 } + 18 x ^ { 2 } - 86 x - 30$
$\left(3\right)\left(9a^4\right)\left(-7\right)$
$\left(x^{-4}\right)^{-9}$
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