$-2xy=10$
$2x^4+3x^3-2x^2-x$
$a^2+13a+30$
$\left(\left(\left(4\right)^2\right)^1\right)^5$
$\left(-9rs^2\right)\:\cdot\:\left(-2r^5s^{12}\right)$
$\left(2+x\right)y^2=\left(2-x\right)x^2$
$-2-\:\left(-5\right)+\:\left(-1\right)$
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