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 = 0.4 // - 0.4
x/3.1-0.4 = 0
0.32258065*x-0.4 = 0 // + 0.4
0.32258065*x = 0.4 // : 0.32258065
x = 0.4/0.32258065
x = 1.23999998
x = 1.23999998
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