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b in (-oo:+oo)
b/17-((6*b)/17) = 40/17 // - 40/17
b/17-((6*b)/17)-(40/17) = 0
b/17+(-6/17)*b-40/17 = 0
-5/17*b-40/17 = 0 // + 40/17
-5/17*b = 40/17 // : -5/17
b = 40/17/(-5/17)
b = -8
b = -8
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