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b in (-oo:+oo)
b/13-((4*b)/13) = 21/13 // - 21/13
b/13-((4*b)/13)-(21/13) = 0
b/13+(-4/13)*b-21/13 = 0
-3/13*b-21/13 = 0 // + 21/13
-3/13*b = 21/13 // : -3/13
b = 21/13/(-3/13)
b = -7
b = -7
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