$\frac{dy}{dx}=\:\frac{\left(xy+2x-y-2\right)}{xy-5x+6y-30}$
$80ab+5+28ab+21+34c$
$4m^2-\:9n^2$
$3\sin\left(x\right)=1+\cos\left(2x\right)$
$\frac{x^2+3x-10}{x+1}$
$\frac{27-8n^3}{3-2n}$
$x^2+x-182$
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