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b in (-oo:+oo)
-b-b-10 = -67/6 // + -67/6
-b-b-(-67/6)-10 = 0
67/6-b-b-10 = 0
7/6-2*b = 0 // - 7/6
-2*b = -7/6 // : -2
b = -7/6/(-2)
b = 7/12
b = 7/12
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