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d in (-oo:+oo)
1-(4*d)-d = 61 // - 61
1-(4*d)-d-61 = 0
1-4*d-d-61 = 0
-5*d-60 = 0 // + 60
-5*d = 60 // : -5
d = 60/(-5)
d = -12
d = -12
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