$\frac{dy}{dx}+y=e^{-3x}\cos\left(2x\right)$
$4+3-\left(-3+10\right)$
$18+n=2$
$\left(7x^{m+2}y-x^n\right)^2$
$\left(-x+5\right)\left(x+5\right)$
$\left(a-9\right)\left(a-12\right)$
$\frac{2x^4-4x^3+x-6}{x+2}$
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