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/10 = 8.5 // - 8.5
u/10-8.5 = 0
1/10*u-8.5 = 0 // + 8.5
1/10*u = 8.5 // : 1/10
u = 8.5/1/10
u = 85
u = 85
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