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b in (-oo:+oo)
3 = 3*b-(2*b)+8 // - 3*b-(2*b)+8
2*b-(3*b)-8+3 = 0
2*b-3*b-8+3 = 0
-b-5 = 0 // + 5
-b = 5 // * -1
b = -5
b = -5
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