My math 
A=4
B=1
C=2
D=3
E=3
B + C = D
B = 1 or 8
B = D / 3
B X D = E
A + E = 2 + ( C + D )
-8 can't be a third of any inputs, so B = 1
-1 X 3 = 3 D = 3
-3 - 1 = 2, C = 2
-1 X 3 = 3 again E = 3
-2 + ( 2 + 3 ) = 7, 7 - 3 = 4, A = 4
B = 1 or 8
B = D / 3
B X D = E
A + E = 2 + ( C + D )
-8 can't be a third of any inputs, so B = 1
-1 X 3 = 3 D = 3
-3 - 1 = 2, C = 2
-1 X 3 = 3 again E = 3
-2 + ( 2 + 3 ) = 7, 7 - 3 = 4, A = 4
B=1
C=2
D=3
E=3