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d in (-oo:+oo)
(-5/6)*d = -1/2 // + -1/2
(-5/6)*d-(-1/2) = 0
(-5/6)*d+1/2 = 0
1/2-5/6*d = 0 // - 1/2
-5/6*d = -1/2 // : -5/6
d = -1/2/(-5/6)
d = 3/5
d = 3/5
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