70-q-q-2q=80 We'll this is confusing
70 - q - q - 2q = 80-4q = 80 - 70-4q = -10q = -10/-4q = -2.5
70-q-q-2q=80or, 70 - 2q - 2q = 80or, 70 - 4q = 80or, -4q = 80 - 70or, -4q = 10or, q = 10/-4or, q = -2.5 (ans)