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b in (-oo:+oo)
3*b-(4*b)-3 = -13/4 // + -13/4
3*b-(4*b)-(-13/4)-3 = 0
3*b-4*b+13/4-3 = 0
1/4-b = 0 // - 1/4
-b = -1/4 // * -1
b = 1/4
b = 1/4
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