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b in (-oo:+oo)
4/13 = 2*b+(6*b)/26 // - 2*b+(6*b)/26
4/13-(2*b)-((6*b)/26) = 0
(-3/13)*b-2*b+4/13 = 0
4/13-29/13*b = 0 // - 4/13
-29/13*b = -4/13 // : -29/13
b = -4/13/(-29/13)
b = 4/29
b = 4/29
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