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b in (-oo:+oo)
(-1/2)*b+7/9 = 77/18 // - 77/18
(-1/2)*b+7/9-(77/18) = 0
(-1/2)*b+7/9-77/18 = 0
-1/2*b-7/2 = 0 // + 7/2
-1/2*b = 7/2 // : -1/2
b = 7/2/(-1/2)
b = -7
b = -7
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