Question

(5a-8ab+5)+(-3a+4ab-9)

Answer 1

$(5a-8ab+5)+(-3a+4ab-9)\\(5a-3a-8ab+4ab+5-9)\\(2a-4ab-4)$

Answer 2

(5a-8ab+5)+(-3a+4ab-9)
5a - 8ab + 5 - 3a + 4ab - 9
5a - 3a - 8ab + 4ab + 5 - 9
2a - 4ab - 4

Espero ter ajudado.