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b in (-oo:+oo)
4/5-((3/4)*b)-b = 261/20 // - 261/20
4/5-((3/4)*b)-b-(261/20) = 0
(-3/4)*b-b+4/5-261/20 = 0
-7/4*b-49/4 = 0 // + 49/4
-7/4*b = 49/4 // : -7/4
b = 49/4/(-7/4)
b = -7
b = -7
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