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b in (-oo:+oo)
2/9-((1/7)*b) = 80/441 // - 80/441
2/9-((1/7)*b)-(80/441) = 0
(-1/7)*b+2/9-80/441 = 0
2/49-1/7*b = 0 // - 2/49
-1/7*b = -2/49 // : -1/7
b = -2/49/(-1/7)
b = 2/7
b = 2/7
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