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d in (-oo:+oo)
5*(7*d-5) = 80 // - 80
5*(7*d-5)-80 = 0
5*(7*d-5)-80 = 0
35*d-105 = 0
35*d-105 = 0
35*d-105 = 0 // + 105
35*d = 105 // : 35
d = 105/35
d = 3
d = 3
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