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b in (-oo:+oo)
(-6/7)*b+2 = 18/7 // - 18/7
(-6/7)*b-(18/7)+2 = 0
(-6/7)*b-18/7+2 = 0
-6/7*b-4/7 = 0 // + 4/7
-6/7*b = 4/7 // : -6/7
b = 4/7/(-6/7)
b = -2/3
b = -2/3
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