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b in (-oo:+oo)
2/15-(5/9) = b // - b
2/15-b-(5/9) = 0
2/15-b-5/9 = 0
-b-19/45 = 0 // + 19/45
-b = 19/45 // * -1
b = -19/45
b = -19/45
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