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d in (-oo:+oo)
6*d+3 = 4*d-1 // - 4*d-1
6*d-(4*d)+1+3 = 0
6*d-4*d+1+3 = 0
2*d+4 = 0 // - 4
2*d = -4 // : 2
d = -4/2
d = -2
d = -2
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