$1=x^4+5y^3$
$x^2+15x+10$
$3ab+4a+15b+20$
$y'-y=e^-2x,\:y\left(0\right)=2$
$x^2\frac{dy}{dx}+12y=4$
$\left(2x^4-12\right)\left(x^4+8\right)$
$\lim_{x\to\infty}\left(1-\frac{7}{x}\right)^{2x}$
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