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b in (-oo:+oo)
4/13 = (2*b)/13+(2*b)/26 // - (2*b)/13+(2*b)/26
4/13-((2*b)/13)-((2*b)/26) = 0
(-2/13)*b+(-1/13)*b+4/13 = 0
4/13-3/13*b = 0 // - 4/13
-3/13*b = -4/13 // : -3/13
b = -4/13/(-3/13)
b = 4/3
b = 4/3
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