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b in (-oo:+oo)
-3 = b-6*b+1/2 // - b-6*b+1/2
-(-6*b)-b-(1/2)-3 = 0
6*b-b-1/2-3 = 0
5*b-7/2 = 0 // + 7/2
5*b = 7/2 // : 5
b = 7/2/5
b = 7/10
b = 7/10
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