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d in (-oo:+oo)
-4 = 3*d-6*d+2 // - 3*d-6*d+2
-(-6*d)-(3*d)-4-2 = 0
6*d-3*d-4-2 = 0
3*d-6 = 0 // + 6
3*d = 6 // : 3
d = 6/3
d = 2
d = 2
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