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b in (-oo:+oo)
b/3 = 6/3 // - 6/3
b/3-(6/3) = 0
b/3-2 = 0
1/3*b-2 = 0 // + 2
1/3*b = 2 // : 1/3
b = 2/1/3
b = 6
b = 6
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