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b in (-oo:+oo)
2*b+2 = 20/7 // - 20/7
2*b-(20/7)+2 = 0
2*b-20/7+2 = 0
2*b-6/7 = 0 // + 6/7
2*b = 6/7 // : 2
b = 6/7/2
b = 3/7
b = 3/7
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