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d in (-oo:+oo)
-106 = 2-5*d-(4*d) // - 2-5*d-(4*d)
4*d-(-5*d)-106-2 = 0
5*d+4*d-106-2 = 0
9*d-108 = 0 // + 108
9*d = 108 // : 9
d = 108/9
d = 12
d = 12
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