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d in (-oo:+oo)
12 = 2*d-(4*d)+10 // - 2*d-(4*d)+10
4*d-(2*d)-10+12 = 0
4*d-2*d-10+12 = 0
2*d+2 = 0 // - 2
2*d = -2 // : 2
d = -2/2
d = -1
d = -1
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