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b in (-oo:+oo)
2*b-(4/2) = 10 // - 10
2*b-(4/2)-10 = 0
2*b-10-2 = 0
2*b-12 = 0 // + 12
2*b = 12 // : 2
b = 12/2
b = 6
b = 6
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