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d in (-oo:+oo)
(-5/6)*d-((1/6)*d)+4 = 7 // - 7
(-5/6)*d-((1/6)*d)-7+4 = 0
(-5/6)*d+(-1/6)*d-7+4 = 0
-d-3 = 0 // + 3
-d = 3 // * -1
d = -3
d = -3
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