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b in (-oo:+oo)
4/13 = (-2/13)*b+(6/26)*b // - (-2/13)*b+(6/26)*b
4/13-((-2/13)*b)-((6/26)*b) = 0
(2/13)*b+(-3/13)*b+4/13 = 0
4/13-1/13*b = 0 // - 4/13
-1/13*b = -4/13 // : -1/13
b = -4/13/(-1/13)
b = 4
b = 4
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