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b in (-oo:+oo)
(b-4)/6 = b/2 // - b/2
(b-4)/6-(b/2) = 0
(b-4)/6-b/2 = 0
(2*(b-4))/(2*6)+(6*(-b))/(2*6) = 0
2*(b-4)+6*(-b) = 0
-4*b-8 = 0
(-4*b-8)/(2*6) = 0
(-4*b-8)/(2*6) = 0 // * 2*6
-4*b-8 = 0
-4*b-8 = 0 // + 8
-4*b = 8 // : -4
b = 8/(-4)
b = -2
b = -2
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