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