$4x-1>4x$
$x^2-18x=0$
$\frac{2x^3\:-\:5x^2\:+\:3x\:+\:2}{x^2\:+\:2x\:+\:1}$
$\left(-12\right)\left(7\right)\left(-21\right)\left(-3\right)$
$-\frac{90}{1-4n}+5=11$
$\int\left(\frac{x^3}{x^4+7}\right)dx$
$\left(x^3+5x^3y^4\right)dx+e^{x^4}y^3dy=0$
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