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d in (-oo:+oo)
2*(3*d+6) = -18 // + 18
2*(3*d+6)+18 = 0
2*(3*d+6)+18 = 0
6*d+30 = 0
6*d+30 = 0
6*d+30 = 0 // - 30
6*d = -30 // : 6
d = -30/6
d = -5
d = -5
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