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b in (-oo:+oo)
(1*b)/13-((9*b)/13) = 64/13 // - 64/13
(1*b)/13-((9*b)/13)-(64/13) = 0
b/13+(-9/13)*b-64/13 = 0
-8/13*b-64/13 = 0 // + 64/13
-8/13*b = 64/13 // : -8/13
b = 64/13/(-8/13)
b = -8
b = -8
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