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/7 = 17.92 // - 17.92
u/7-17.92 = 0
1/7*u-17.92 = 0 // + 17.92
1/7*u = 17.92 // : 1/7
u = 17.92/1/7
u = 125.44000251
u = 125.44000251
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