$\left(x+5\right)\cdot\:\left(x^2-5x+25\right)$
$\:\frac{7}{k}+r^2=\cos\left(2t\right)$
$15f-f$
$7-\left(3-5-6\right)$
$\left(-5\right)\left(-3\right)+\left(-10\right)$
$400x^2\:y^2-120xyz+9z^2$
$2-4-\left|-6\right|$
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