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d in (-oo:+oo)
10/3 = d/1.2 // - d/1.2
10/3-(d/1.2) = 0
10/3-0.83333333*d = 0
10/3-0.83333333*d = 0 // - 10/3
-0.83333333*d = -10/3 // : -0.83333333
d = -10/3/(-0.83333333)
d = 4.00000001
d = 4.00000001
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