$\frac{14}{\left(-7\right)}$
$-1\:-\:-3:-3$
$-10v+5v$
$\left(2x^2yz^3\right)\left(3x^3y^8\right)$
$\left(3b^3-2a^2\right)^4$
$\frac{1}{\cot\left(x\right)}-2\cot\left(x\right)$
$m^{10}-81$
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