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b in (-oo:+oo)
13-(b/6) = (2.05*b)/4 // - (2.05*b)/4
13-(b/6)-((2.05*b)/4) = 0
13-(b/6)-0.5125*b = 0
13-0.67916667*b = 0 // - 13
-0.67916667*b = -13 // : -0.67916667
b = -13/(-0.67916667)
b = 19.1411042
b = 19.1411042
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