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d in (-oo:+oo)
(-5/6)*d-7 = -23/3 // + -23/3
(-5/6)*d-(-23/3)-7 = 0
(-5/6)*d+23/3-7 = 0
2/3-5/6*d = 0 // - 2/3
-5/6*d = -2/3 // : -5/6
d = -2/3/(-5/6)
d = 4/5
d = 4/5
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