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