$\int\left(kx^2+x\right)dx$
$\frac{dy}{dx}+y^7x+5y=0$
$16x^2-121y^2$
$+15+1\left(-40\right)-2$
$f^2+14+49$
$\int_{-\infty}^{-1}x^{-\frac{15}{7}}dx$
$x\frac{dy}{dx}+x^2=5$
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