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b in (-oo:+oo)
6*b-(5/3) = 12*b-(10/6) // - 12*b-(10/6)
6*b-(12*b)-(5/3)+10/6 = 0
6*b-12*b-5/3+10/6 = 0
-6*b = 0 // : -6
b = 0
b = 0
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