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b in (-oo:+oo)
3 = 0.75*b-((1/4)*b)-4+5 // - 0.75*b-((1/4)*b)-4+5
(1/4)*b-(0.75*b)-5+3+4 = 0
(1/4)*b-0.75*b-5+3+4 = 0
2-0.5*b = 0 // - 2
-0.5*b = -2 // : -0.5
b = -2/(-0.5)
b = 4
b = 4
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