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