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a in (-oo:+oo)
-3/7 = a/14 // - a/14
-(a/14)-3/7 = 0
-1/14*a-3/7 = 0 // + 3/7
-1/14*a = 3/7 // : -1/14
a = 3/7/(-1/14)
a = -6
a = -6
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