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d in (-oo:+oo)
41.12 = (3.14*d)/2 // - (3.14*d)/2
41.12-((3.14*d)/2) = 0
41.12-1.57*d = 0
41.12-1.57*d = 0 // - 41.12
-1.57*d = -41.12 // : -1.57
d = -41.12/(-1.57)
d = 26.1910828
d = 26.1910828
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