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b in (-oo:+oo)
-(2*b)-2/3 = -68/3 // + -68/3
-(2*b)-2/3-(-68/3) = 0
68/3-2*b-2/3 = 0
22-2*b = 0 // - 22
-2*b = -22 // : -2
b = -22/(-2)
b = 11
b = 11
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