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