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b in (-oo:+oo)
(9/10)*b-1 = (-19/20)*b+4 // - (-19/20)*b+4
(9/10)*b-((-19/20)*b)-4-1 = 0
(9/10)*b+(19/20)*b-4-1 = 0
37/20*b-5 = 0 // + 5
37/20*b = 5 // : 37/20
b = 5/37/20
b = 100/37
b = 100/37
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