Terms and Numbers Mixed

In $4x+3-2x = 11$, a number sits between the two x-terms. The order of the terms in a sum does not matter, so you can collect the terms that are alike. Here $4x-2x$ is $2x$, and the 3 stays as it is.

$$2x+3 = 11$$

Now it is an ordinary two-step equation. Subtract 3 from both sides, then divide by 2, and you get $x = 4$. Check: $4\cdot 4+3-2\cdot 4 = 16+3-8 = 11$.

When you collect terms, keep each sign with its term. The second x-term here is $-2x$, not $2x$. Plain numbers on the same side collect too: $x+5-2$ is $x+3$. Simplify until each side has at most one x-term and one number, then undo.