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b in (-oo:+oo)
3/5-((4/5)*b) = 17/55 // - 17/55
3/5-((4/5)*b)-(17/55) = 0
(-4/5)*b+3/5-17/55 = 0
16/55-4/5*b = 0 // - 16/55
-4/5*b = -16/55 // : -4/5
b = -16/55/(-4/5)
b = 4/11
b = 4/11
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