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