Question

subtract

a- b+c from 3a - 6b - 8c​

Answer 1

$\huge\tt\colorbox{yellow}{Answer}$

$= 3a - 6b - 8c - (a - b + c)$

$= 3a - 6b - 8c - a + b - c$

$= 3a - a - 6b + b - 8c - c$

$\bold{ = 2a - 5b - 9c}$

Answer 2

$\huge\tt\colorbox{pink}{Answer}$

$3a - 6b - 8c - (a - b + c) \\ 3a - 6b - 8c - a + b - c \\ 2a - 5b - 9c$