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d in (-oo:+oo)
(-5/6)*d+8 = 13 // - 13
(-5/6)*d-13+8 = 0
-5/6*d-5 = 0 // + 5
-5/6*d = 5 // : -5/6
d = 5/(-5/6)
d = -6
d = -6
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