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b in (-oo:+oo)
26/9 = (13/4)*b // - (13/4)*b
26/9-((13/4)*b) = 0
(-13/4)*b+26/9 = 0
26/9-13/4*b = 0 // - 26/9
-13/4*b = -26/9 // : -13/4
b = -26/9/(-13/4)
b = 8/9
b = 8/9
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