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b in (-oo:+oo)
b/7-((8*b)/17) = 63/17 // - 63/17
b/7-((8*b)/17)-(63/17) = 0
b/7+(-8/17)*b-63/17 = 0
-39/119*b-63/17 = 0 // + 63/17
-39/119*b = 63/17 // : -39/119
b = 63/17/(-39/119)
b = -147/13
b = -147/13
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