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b in (-oo:+oo)
5/2 = b/7 // - b/7
5/2-(b/7) = 0
5/2-1/7*b = 0 // - 5/2
-1/7*b = -5/2 // : -1/7
b = -5/2/(-1/7)
b = 35/2
b = 35/2
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