Paki answer po makakakuha po kayo nang 26 points brainliest answer at follow ko po kayo tapos thanks

POLYNOMIALS
1. 7x + 2x + 19x=
2.6x -3 + 3x - 9=
3. (3x - 4y) - (x + 2y)=
4.(x + 5) (x - 7)=