$12\cdot14$
$\frac{dy}{dx}+2y=xy^4$
$\left(3y-5=45\right)\left(y=3x-2\right)$
$\frac{dy}{dx}+3y=x+e^{-x}$
$\left[-128.5\right]^3$
$4x+1\le9$
$\frac{\left(-x^2+x+1\right)}{\left(x+3\right)}$
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