solve the differential equation :dy/dx=1+e^x-y
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https://www.meritnation.com/ask-answer/question/the-solution-of-the-differential-equation-dy-dx-1-e-to-the/differential-equations/2126820
https://www.meritnation.com/ask-answer/question/the-solution-of-the-differential-equation-dy-dx-1-e-to-the/differential-equations/2126820