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b in (-oo:+oo)
2*b-(b/2)-(3/7) = b+3/14 // - b+3/14
2*b-(b/2)-b-(3/7)-(3/14) = 0
2*b-(b/2)-b-3/7-3/14 = 0
1/2*b-9/14 = 0 // + 9/14
1/2*b = 9/14 // : 1/2
b = 9/14/1/2
b = 9/7
b = 9/7
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