Combine like terms in the expression 4 + 5y + y + 2x2 + 3x2.
We can combine the two terms with variable part y to get
4 + 6y + 2x2 + 3x2,
and we can also combine the terms with variable part x2 to get
4 + 6y + 5x2.
Sometimes it is helpful to rearrange the terms such that like terms are next to each other. Just don't put them too close together unless they have both recently bathed.