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d in (-oo:+oo)
12 = 4*d-(3*d)+10 // - 4*d-(3*d)+10
3*d-(4*d)-10+12 = 0
3*d-4*d-10+12 = 0
2-d = 0 // - 2
-d = -2 // * -1
d = 2
d = 2
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