$-\left(-90\right)\left(-6\right)$
$\left(-3x^1y^7\right)\left(-2x^4y^3\right)^2$
$\frac{x}{\left(x^{+9}\right)}$
$4+13+1+-8$
$\frac{x^3-x^2+1}{x^2+4}$
$a^2-8a-9=0$
$dx-e^{-2x}dy=0$
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