NOTE: `y’` means the derivative of `y`, that is `(dy)/dx`.
This question requires us to integrate, and in the process, to find the constant of integration.
Put `u = 2x + 1`.
Now `du = 2\ dx`
Now if `x = 0` then `y = 2` (from the question).
and this gives `K = 5/3`.
is the required function.
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