Answer:
Depending on what the equation is,
x = (b (d + f)) / c
or
x = (d (b - f)) / c
Step-by-step explanation:
cx / d + f = b
If f is in the denominator (cx / (d + f) = b)
cx = b (d + f)
x = (b (d + f)) / c
If f is added after the fraction (cx/(d) + f = b)
cx/d = b - f
cx = d(b - f)
x = (d (b - f)) / c