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b in (-oo:+oo)
(2/7)*b+9 = 61/7 // - 61/7
(2/7)*b-(61/7)+9 = 0
(2/7)*b-61/7+9 = 0
2/7*b+2/7 = 0 // - 2/7
2/7*b = -2/7 // : 2/7
b = -2/7/2/7
b = -1
b = -1
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