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