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