If it's not what You are looking for type in the equation solver your own equation and let us solve it.
s in (-oo:+oo)
s = 1/2.2 // - 1/2.2
s-(1/2.2) = 0
s-0.45454545 = 0
s-0.45454545 = 0 // + 0.45454545
s = 0.45454545
s = 0.45454545
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