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b in (-oo:+oo)
(1/13)*b-((3/13)*b) = 8/13 // - 8/13
(1/13)*b-((3/13)*b)-(8/13) = 0
(1/13)*b+(-3/13)*b-8/13 = 0
-2/13*b-8/13 = 0 // + 8/13
-2/13*b = 8/13 // : -2/13
b = 8/13/(-2/13)
b = -4
b = -4
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