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d in (-oo:+oo)
5*(3*d-6) = -210 // + 210
5*(3*d-6)+210 = 0
5*(3*d-6)+210 = 0
15*d+180 = 0
15*d+180 = 0
15*d+180 = 0 // - 180
15*d = -180 // : 15
d = -180/15
d = -12
d = -12
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