Let's simplify the expression step by step:

The expression is:

\[
3 + x \cdot 2 + 3x3 + x \cdot 2 + 3x
\]

1. First, combine like terms. Note that \(3x3\) is likely a typographical error, and should probably be interpreted as \(3 \cdot x^3\) (3 times \(x\) cubed).

So rewriting the expression with that assumption, we get:

\[
3 + 2x + 3x^3 + 2x + 3x
\]

2. Now combine the terms that contain \(x\):

- \(2x + 2x + 3x = 7x\)

3. Putting it all together, we get:

\[
3 + 3x^3 + 7x
\]

Thus, the simplified expression is:

\[
3 + 3x^3 + 7x
\]

If \(3x3\) was not meant to be \(3 \cdot x^3\), please clarify for further assistance.