Given the expression:
[tex]\mleft(-2x^2+5\mright)+(6x^2+7)[/tex]Removing the parentheses and combining like terms.
[tex]\begin{gathered} =-2x^2+5+6x^2+7 \\ =-2x^2+6x^2+5+7 \\ \\ =4x^2+12 \end{gathered}[/tex]so, the answer will be:
[tex]4x^2+12[/tex]