[INST] Simplify the following expression: 
2x+3x^2+1-(6-2x-3x^2).
/n [/INST]  ###Response: The given expression can be rewritten as 2x+3x^2+1-6+2x+3x^2. Combining like terms, this last expression is equal to (2x+2x)+(3x^2+3x^2)+(1-6)=6x^2+4x-5.