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d in (-oo:+oo)
1-6*d-(2*d) = 13/5 // - 13/5
1-6*d-(2*d)-(13/5) = 0
1-6*d-2*d-13/5 = 0
-8*d-8/5 = 0 // + 8/5
-8*d = 8/5 // : -8
d = 8/5/(-8)
d = -1/5
d = -1/5
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