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b in (-oo:+oo)
(4/5)*b-((1/2)*b)+1 = -13/5 // + -13/5
(4/5)*b-((1/2)*b)-(-13/5)+1 = 0
(4/5)*b+(-1/2)*b+13/5+1 = 0
3/10*b+18/5 = 0 // - 18/5
3/10*b = -18/5 // : 3/10
b = -18/5/3/10
b = -12
b = -12
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