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d in (-oo:+oo)
2*d-4 = -4*d-16 // + -4*d-16
2*d-(-4*d)-4+16 = 0
2*d+4*d-4+16 = 0
6*d+12 = 0 // - 12
6*d = -12 // : 6
d = -12/6
d = -2
d = -2
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