$\frac{dy}{dx}=\frac{y-x}{x+2y}$
$x^4-24x^2+144$
$y'\:=\:4y\:+\:x^2\:+\:9$
$4a^3bx+4bx$
$9\left(1+3c\right)-8c$
$\left(71x+15x^2+x^3+105\right)\left(44x-12x^2+x^3-48\right)$
$4x^2-11x=.7$
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