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b in (-oo:+oo)
b/17-((6*b)/17) = 20/17 // - 20/17
b/17-((6*b)/17)-(20/17) = 0
b/17+(-6/17)*b-20/17 = 0
-5/17*b-20/17 = 0 // + 20/17
-5/17*b = 20/17 // : -5/17
b = 20/17/(-5/17)
b = -4
b = -4
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