### Instruction: Simplify the following expression:   \[2x+3x^2+1-(6-2x-3x^2).\].### Response: Ok, let's distribute the negative through the parentheses.
So we get $2x+3x^2+1-6+2x+3x^2$.
Now we can combine like terms.
So we get $4x+6x^2-5$.