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d in (-oo:+oo)
7*d+1 = 4*d+34 // - 4*d+34
7*d-(4*d)-34+1 = 0
7*d-4*d-34+1 = 0
3*d-33 = 0 // + 33
3*d = 33 // : 3
d = 33/3
d = 11
d = 11
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