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d in (-oo:+oo)
6*(5*d+4) = 114 // - 114
6*(5*d+4)-114 = 0
6*(5*d+4)-114 = 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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