1) (x^2 + 5) + (x^2 - 4) = 2x^2 + 12) (y - 2x) + (4x + 6) = 2x + y + 63) (2ab - 1) + (ab + 10) = 3ab + 94) (1.8a^2 - y^3) + (22a^2 + 2y^3) = 23.8a^2 + y^3
1) (x^2 + 5) + (x^2 - 4) = 2x^2 + 1
2) (y - 2x) + (4x + 6) = 2x + y + 6
3) (2ab - 1) + (ab + 10) = 3ab + 9
4) (1.8a^2 - y^3) + (22a^2 + 2y^3) = 23.8a^2 + y^3