If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r in (-oo:+oo)
r = 16/3.14 // - 16/3.14
r-(16/3.14) = 0
r-5.0955414 = 0
r-5.0955414 = 0 // + 5.0955414
r = 5.0955414
r = 5.0955414
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