$4-\left(-5\right)-13$
$-x+2-3\left(x+5\right);\:x=2$
$\left(-18\right)\left(47\right)$
$3m^2-16m-2=-7$
$\:121k^2\:-\:64$
$3m+2n+5m-10+7n$
$a+\frac{1}{a}=3$
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