$25-\left(-17\right)$
$\frac{\left(1+x^2+y^2+x^2y^2\right)dy}{dx}=y^2$
$\frac{dy}{dx}x+x^2y-y^2-20=0$
$12+\left(8-15\right)-\left(5+8\right)$
$+2+6-10+1+4-7-4+8$
$3x^2-4x^2-5x^2$
$16x^2+2x+6$
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