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  "body": "\n## Summary\n\nAn exact equation is a first-order equation $M\\, dx + N\\, dy = 0$ whose left side is the total differential of a function $\\psi(x, y)$.\nIts solutions lie on the level curves $\\psi(x, y) = C$. See the [[definition|0EC7AGJ0PX]].\n",
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