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d in (-oo:+oo)
7*(1*d-1) = 35 // - 35
7*(1*d-1)-35 = 0
7*(d-1)-35 = 0
7*(d-1)-35 = 0
7*d-42 = 0
7*d-42 = 0
7*d-42 = 0 // + 42
7*d = 42 // : 7
d = 42/7
d = 6
d = 6
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