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b in (-oo:+oo)
b/17-((4*b)/17) = 15/17 // - 15/17
b/17-((4*b)/17)-(15/17) = 0
b/17+(-4/17)*b-15/17 = 0
-3/17*b-15/17 = 0 // + 15/17
-3/17*b = 15/17 // : -3/17
b = 15/17/(-3/17)
b = -5
b = -5
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