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b in (-oo:+oo)
13-(b/6) = 2-((0.5*b)/4) // - 2-((0.5*b)/4)
(0.5*b)/4-(b/6)-2+13 = 0
11-0.04166667*b = 0 // - 11
-0.04166667*b = -11 // : -0.04166667
b = -11/(-0.04166667)
b = 263.99997888
b = 263.99997888
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