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b in (-oo:+oo)
(-6/7)*b-(1/2) = -5/154 // + -5/154
(-6/7)*b-(1/2)-(-5/154) = 0
(-6/7)*b-1/2+5/154 = 0
-6/7*b-36/77 = 0 // + 36/77
-6/7*b = 36/77 // : -6/7
b = 36/77/(-6/7)
b = -6/11
b = -6/11
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