Suppose you mean Ax - (B/C) = D. We have:
Ax = (B/C) + D
Ax = (B/C) + (CD/C)
Ax = (B + CD) / C
x = (B + CD) / (AC)
Suppose you mean (Ax - B) / C = D instead. We have:
(Ax - B) / C = D
Ax - B = CD
Ax = B + CD
x = (B + CD) / A
Note that we assume A and C to be non-zero in both cases.