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/17.5 = 7 // - 7
u/17.5-7 = 0
0.05714286*u-7 = 0 // + 7
0.05714286*u = 7 // : 0.05714286
u = 7/0.05714286
u = 122.49999388
u = 122.49999388
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