$14x-5\left(-2x+3\right)$
$-\:\left(-72\right)\::\:\left(\:-9\right)+\left(-60\right)\:+\:\left(-\:7\right)\:x\:\left(+15\right)\::\:\left(-3\right)$
$\left(2m^2-3m-14\right)^2$
$\left(a^{x+2}b^2+3c\right)^2$
$15x+25y$
$\lim_{x\to2}\left(\frac{\left(x-2\right)^2}{3x^2-3x-6}\right)$
$75x^2-75x-\:1$
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