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b in (-oo:+oo)
(-1/2)*b+6/7 = 8/7 // - 8/7
(-1/2)*b+6/7-(8/7) = 0
(-1/2)*b+6/7-8/7 = 0
-1/2*b-2/7 = 0 // + 2/7
-1/2*b = 2/7 // : -1/2
b = 2/7/(-1/2)
b = -4/7
b = -4/7
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