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b in (-oo:+oo)
-2/3 = (-2/3)*b+1/2 // - (-2/3)*b+1/2
-((-2/3)*b)-2/3-(1/2) = 0
(2/3)*b-2/3-1/2 = 0
2/3*b-7/6 = 0 // + 7/6
2/3*b = 7/6 // : 2/3
b = 7/6/2/3
b = 7/4
b = 7/4
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