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b in (-oo:+oo)
14/3 = (7/9)*b // - (7/9)*b
14/3-((7/9)*b) = 0
(-7/9)*b+14/3 = 0
14/3-7/9*b = 0 // - 14/3
-7/9*b = -14/3 // : -7/9
b = -14/3/(-7/9)
b = 6
b = 6
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