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