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b in (-oo:+oo)
(2*b-4)/2 = 10 // - 10
(2*b-4)/2-10 = 0
(2*b-4)/2+(-10*2)/2 = 0
2*b-10*2-4 = 0
2*b-24 = 0
(2*b-24)/2 = 0
(2*b-24)/2 = 0 // * 2
2*b-24 = 0
2*b-24 = 0 // + 24
2*b = 24 // : 2
b = 24/2
b = 12
b = 12
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