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b in (-oo:+oo)
13-((13/15)*b) = 6 // - 6
13-((13/15)*b)-6 = 0
(-13/15)*b-6+13 = 0
7-13/15*b = 0 // - 7
-13/15*b = -7 // : -13/15
b = -7/(-13/15)
b = 105/13
b = 105/13
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