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b in (-oo:+oo)
b/6-(2/7) = 0
b/6-2/7 = 0
1/6*b-2/7 = 0 // + 2/7
1/6*b = 2/7 // : 1/6
b = 2/7/1/6
b = 12/7
b = 12/7
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