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