Question

suma de (a+10b-9)+(3a-5b+4c)+(2c+b-6)

Answer 1

4a+6b+6c-15

es agrupacion de terminos
a+3a= 4a
10b-5b+b= 6b
4c+2c= 6c
-9-6= -15

Answer 2

Reducir.

(a + 10b - 9) + (3a - 5b + 4c) + (2c + b - 6)

a + 10b - 9 + 3a - 5b + 4c + 2c + b - 6 

a + 3a  + 10b - 5b + b - 9 - 6 + 4c + 2c
 
   4a + 5b + b - 15 + 6c
 
      6c + 6b - 15 + 6c