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b in (-oo:+oo)
19/15 = b+2/3 // - b+2/3
19/15-b-(2/3) = 0
19/15-b-2/3 = 0
3/5-b = 0 // - 3/5
-b = -3/5 // * -1
b = 3/5
b = 3/5
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