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b in (-oo:+oo)
b = b/2+4+4 // - b/2+4+4
b-(b/2)-4-4 = 0
1/2*b-8 = 0 // + 8
1/2*b = 8 // : 1/2
b = 8/1/2
b = 16
b = 16
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