Solve the differential equation: `(1+y+x^2y)dx+(x+x^3)dy=0`

Explanation

To solve the differential equation \((1+y+x^2y)dx+(x+x^3)dy=0\), we will follow these steps:

### Step 1: Rewrite the Equation
We start with the given differential equation:
\[ (1 + y + x^2y)dx + (x + x^3)dy = 0 \]
Rearranging gives:
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