Question

7c + 12a + 10b - (+ 5 * a) + (- 8b) + (- 7c)​

Answer 1

Step-by-step explanation:

$7c + 12a + 10b - ( + 5 \times a) + ( - 8b) + ( - 7c) \\ = 7c + 12a + 10b - 5a - 8b - 7c \\ = 12a - 5a + 10b - 8b + 7c - 7c \\ = 7a + 2b$

Answer 2

Answer:

7c + 12a + 10b - 5a -8b -7c = 0

12a +10b -5a - 8b = 0

7a + 2b = 0

7a = -2b

a = -2b/7

a/b = -2/7

so the ratio is

a:b -2:7