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