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b in (-oo:+oo)
0.75*b+(5/12)*b-(2/3) = -3 // + 3
0.75*b+(5/12)*b-(2/3)+3 = 0
0.75*b+(5/12)*b-2/3+3 = 0
1.16666667*b+7/3 = 0 // - 7/3
1.16666667*b = -7/3 // : 1.16666667
b = -7/3/1.16666667
b = -1.99999999
b = -1.99999999
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