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d in (-oo:+oo)
(-5/6)*d+5 = 7*d+107/12 // - 7*d+107/12
(-5/6)*d-(7*d)-(107/12)+5 = 0
(-5/6)*d-7*d-107/12+5 = 0
-47/6*d-47/12 = 0 // + 47/12
-47/6*d = 47/12 // : -47/6
d = 47/12/(-47/6)
d = -1/2
d = -1/2
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