(2/3)((7/8)-4x)-5/8=3/8

I really don't like fractions in my equation, so

times 24
16(7/8 - 4x) - 15 = 9
16 (7/8 - 4x) = 24
7/8 - 4x = 24/16 = 3/2
times 8
7 - 32x = 12
-32x = 5
x = -5/32

or

(2/3)((7/8)-4x) = 5/8+3/8
(2/3)(7/8 - 4x) = 1
times 3/2
7/8 - 4x = 3/2
-4x = 3/2 - 7/8
-4x = 5/8
x = -5/32