The integral to be solved is:
$$\int (1 + x + e^x) \, dx.$$
This integral is a sum of three simpler integrals.
Step 2:
Break the integral into three separate integrals using the linearity of the integral:
$$\int (1 + x + e^x) \, dx = \int 1 \, dx + \int x \, dx +
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