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d in (-oo:+oo)
5*(6*d+7) = 125 // - 125
5*(6*d+7)-125 = 0
5*(6*d+7)-125 = 0
30*d-90 = 0
30*d-90 = 0
30*d-90 = 0 // + 90
30*d = 90 // : 30
d = 90/30
d = 3
d = 3
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