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b in (-oo:+oo)
(-4/7)*b+2/3 = 82/231 // - 82/231
(-4/7)*b+2/3-(82/231) = 0
(-4/7)*b+2/3-82/231 = 0
24/77-4/7*b = 0 // - 24/77
-4/7*b = -24/77 // : -4/7
b = -24/77/(-4/7)
b = 6/11
b = 6/11
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