$-\sqrt{121}+15$
$\left(-3\right)\left(-6\right)\left(-7\right)$
$6x+5y-17x-y+25x-y+5y$
$100x^2-25y^2$
$\left(-4x-y\right)^3$
$-5.23-.73$
$\left(2xyz-3\right)\left(2xyz+3\right)$
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