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d in (-oo:+oo)
7-d = 5*d+61 // - 5*d+61
7-d-(5*d)-61 = 0
7-d-5*d-61 = 0
-6*d-54 = 0 // + 54
-6*d = 54 // : -6
d = 54/(-6)
d = -9
d = -9
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