$2xy\:+\:x^3y$
$\frac{x}{x-3}\le-1$
$-1+-10+12+-1+30$
$y^2+x^2=r$
$-6x^2-11+x^2+15$
$15-\left(2.-1\right)$
$\left(-3\right)^2\left(-4\right)^1$
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