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x in (-oo:+oo)
85/360 = x/81.64 // - x/81.64
85/360-(x/81.64) = 0
85/360-0.0122489*x = 0
17/72-0.0122489*x = 0 // - 17/72
-0.0122489*x = -17/72 // : -0.0122489
x = -17/72/(-0.0122489)
x = 19.27610724
x = 19.27610724
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