Question

subtract a-b-c from a+b+c​

Answer 1

$\huge\underline\mathtt\green{Answer}$

$a + b + c - \: (a - b - c) \\ a + b + c - a + b + c \\ a - a + b + b + c + c \\ 2b + 2c \\ 2(b + c)$

Answer 2

$\huge\tt\colorbox{black}{\color{white}{ANSWER}}$

$According \: to \: the \: question$

$a + b + c - (a - b - c)$

$= a + b + c - a + b + c$

$Group \: the \: like \: terms$

$= a - a + b + b + c + c$

$= 0 + 2b + 2c$

$= 2b + 2c$

$Take \: 2 \: as \: common$

$\bold{= 2(b + c)}$