Question 779033
12(a/4) - 12(a/3) = 12(-1/2)
3a -4a =-6-a = -6
a = 6

check
(6/4) - (6/3) = -1/2
(2/3) - 2 = -1/2
(1.5) - 2 = -1/2
-1/2 = -1/2