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b in (-oo:+oo)
-((4/5)*b)-1/10 = 21/110 // - 21/110
-((4/5)*b)-1/10-(21/110) = 0
(-4/5)*b-1/10-21/110 = 0
-4/5*b-16/55 = 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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