If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
(3/8)*u = 48 // - 48
(3/8)*u-48 = 0
3/8*u-48 = 0 // + 48
3/8*u = 48 // : 3/8
u = 48/3/8
u = 128
u = 128
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