$4x^{-2}\cdot2x^3$
$x^2+9x+18=0$
$\left(x-1\right)\left(x+10\right)+12=0$
$-40\cdot x^2+280\cdot x=0$
$\frac{x^2}{y^2\:+\:2xy}$
$3x+1\le7$
$\frac{6}{6yx}$
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