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b in (-oo:+oo)
(1/3)*b+3 = (1/2)*b // - (1/2)*b
(1/3)*b-((1/2)*b)+3 = 0
(1/3)*b+(-1/2)*b+3 = 0
3-1/6*b = 0 // - 3
-1/6*b = -3 // : -1/6
b = -3/(-1/6)
b = 18
b = 18
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