$\frac{6\cdot5}{-2}+-2^2$
$3\left(-1\right)^2-5+2$
$\left(\frac{x^5}{x^2}\right)\left(3x^3\right)$
$3^5.3^2$
$12-\frac{-10}{2}$
$\left[-\left(-4m-3n\right)\right]-\left[\left(m-7n\right)\right]$
$15^3m^2n$
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