$x+13=5$
$-\left(-6\right)\left(-6\right)$
$2n^2-n-1081$
$\left(2a\right)\left(ab\right)\left(-7ab^4\right)$
$-2x^2-2y-z$
$\frac{x+1}{x-1}+2>\:0$
$\left(10-x\right)y^2=x^3$
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