How do you add:

(x4 - 6) + (x4+ 6)

(x4 - 6) + (x4+ 6)

(x4 - 6) + (x4 + 6)

= x4 - 6 + x4 + 6 {took out parentheses}

= 2x4 {combined like terms}

- Algebra House

= x4 - 6 + x4 + 6 {took out parentheses}

= 2x4 {combined like terms}

- Algebra House