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d in (-oo:+oo)
6*(5*d-1) = 144 // - 144
6*(5*d-1)-144 = 0
6*(5*d-1)-144 = 0
30*d-150 = 0
30*d-150 = 0
30*d-150 = 0 // + 150
30*d = 150 // : 30
d = 150/30
d = 5
d = 5
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