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d in (-oo:+oo)
3*d+1 = 37-6*d // - 37-6*d
3*d-(-6*d)-37+1 = 0
3*d+6*d-37+1 = 0
9*d-36 = 0 // + 36
9*d = 36 // : 9
d = 36/9
d = 4
d = 4
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