Question

subtract the sum (8a-7b+6c) and (-3a-4b-c) from the sum (2a+4b-3x) and a-b-c)

Answer 1

(8a-7b+6c) + (-3a-4b-c) = 5a-11b+5c
(2a+4b-3c) + (a-b-c) =3a+3b-4c

(3a+3b-4c) -(5a-11b+5c) = -2a+14b-9c