$\left(-5\:+7\:times\:1\right)\:-9\:times\:5$
$2x-2x$
$\left(x^{4}-3x^{2}+2\right):\left(x-3\right)$
$-15+3\cdot\:5-3\cdot\:\left(-5\right)^3-5\cdot\:\sqrt{4}$
$y^2-z^2$
$2\left(6x\right)+6+6+6x$
$y^2+2y+2+1$
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