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d in (-oo:+oo)
(4/5)*d+1 = 6*d-(151/5) // - 6*d-(151/5)
(4/5)*d-(6*d)+151/5+1 = 0
(4/5)*d-6*d+151/5+1 = 0
156/5-26/5*d = 0 // - 156/5
-26/5*d = -156/5 // : -26/5
d = -156/5/(-26/5)
d = 6
d = 6
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