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b in (-oo:+oo)
(2/3)*b-1/3 = -5 // + 5
(2/3)*b-1/3+5 = 0
2/3*b+14/3 = 0 // - 14/3
2/3*b = -14/3 // : 2/3
b = -14/3/2/3
b = -7
b = -7
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