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 = 7.76/6.28 // - 7.76/6.28
r-(7.76/6.28) = 0
r-1.23566879 = 0
r-1.23566879 = 0 // + 1.23566879
r = 1.23566879
r = 1.23566879
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