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