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b in (-oo:+oo)
2/10 = b/5 // - b/5
2/10-(b/5) = 0
1/5-1/5*b = 0 // - 1/5
-1/5*b = -1/5 // : -1/5
b = -1/5/(-1/5)
b = 1
b = 1
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