If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/3.1 = 6 // - 6
x/3.1-6 = 0
0.32258065*x-6 = 0 // + 6
0.32258065*x = 6 // : 0.32258065
x = 6/0.32258065
x = 18.59999972
x = 18.59999972
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