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)
(4/5)*u = 8 // - 8
(4/5)*u-8 = 0
4/5*u-8 = 0 // + 8
4/5*u = 8 // : 4/5
u = 8/4/5
u = 10
u = 10
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