9(a - 1) + 3a + 2 (a + 1) =7 (b + 2) - 5b + 6 (b + 1) + 9 = - 6c + 3 (c + 1) + 7c = - 25 + 2 (5 + 1) + 6 =2 (y - 1) + 3 (y + 2) + 6y =AYUDENME PLOX : (?
9(a - 1) + 3a + 2 (a + 1) = 7 (b + 2) - 5b + 6 (b + 1) + 9 = - 6c + 3 (c + 1) + 7c = - 25 + 2 (5 + 1) + 6 = 2 (y - 1) + 3 (y + 2) + 6y = AYUDENME PLOX : (.