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