$x^4+3x^2-6$
$\frac{x+8}{-2}>0$
$\left(y+4\right)^2$
$m^2\:x\:m^9\:x\:m^6$
$\left(+13\right)\cdot\left(+58\right)$
$\left(-4\right)\:\left(-2\right)\:\left(10\right)\:\left(-1\right)$
$5xy^2-15y$
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