Evaluate: `int(4^(x)+5^(x))/(7^(x))dx`

Explanation

To evaluate the integral \( \int \frac{4^x + 5^x}{7^x} \, dx \), we can follow these steps:

### Step 1: Rewrite the Integral
We start by rewriting the integral:
\[ I = \int \frac{4^x + 5^x}{7^x} \, dx = \int \left( \frac{4^x}{7^x} + \frac{5^x}{7^x} \right) \, dx \]
This can be simplified to:
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