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)
u/4 = 5.12 // - 5.12
u/4-5.12 = 0
1/4*u-5.12 = 0 // + 5.12
1/4*u = 5.12 // : 1/4
u = 5.12/1/4
u = 20.48
u = 20.48
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