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x in (-oo:+oo)
-7 = x/(-14)-1 // - x/(-14)-1
1-(x/(-14))-7 = 0
1/14*x-6 = 0 // + 6
1/14*x = 6 // : 1/14
x = 6/1/14
x = 84
x = 84
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