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/11.5 = 0.4 // - 0.4
x/11.5-0.4 = 0
0.08695652*x-0.4 = 0 // + 0.4
0.08695652*x = 0.4 // : 0.08695652
x = 0.4/0.08695652
x = 4.60000009
x = 4.60000009
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