Question

a+3b-4c+4a-b+9c+(-2b)+3c-a

Answer 1

here is ur answer hope it helps please mark as brainliest

Answer 2

$a + 3b - 4c + 4a - b + 9c + ( - 2b) + 3c - a \\ = a - a + 4a + 3b - b - 2b - 4c + 9c + 3c \\ = 4a + 3b - 3b - 4c + 12c \\ = 4a + 8c \\ = 4(a + 2c)$