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b in (-oo:+oo)
1/4-b = -7/12 // + -7/12
1/4-b-(-7/12) = 0
1/4-b+7/12 = 0
5/6-b = 0 // - 5/6
-b = -5/6 // * -1
b = 5/6
b = 5/6
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