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b in (-oo:+oo)
(13-b)/6 = (2-(0.5*b))/4 // - (2-(0.5*b))/4
(13-b)/6-((2-(0.5*b))/4) = 0
(13-b)/6-((2-0.5*b)/4) = 0
(13-b)/6+(-1*(2-0.5*b))/4 = 0
(4*(13-b))/(4*6)+(-1*6*(2-0.5*b))/(4*6) = 0
4*(13-b)-1*6*(2-0.5*b) = 0
40-b = 0
(40-b)/(4*6) = 0
(40-b)/(4*6) = 0 // * 4*6
40-b = 0
40-b = 0 // - 40
-b = -40 // * -1
b = 40
b = 40
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