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x in (-oo:+oo)
-x/14 = 1/2 // - 1/2
-x/14-(1/2) = 0
-x/14-1/2 = 0
-1/14*x-1/2 = 0 // + 1/2
-1/14*x = 1/2 // : -1/14
x = 1/2/(-1/14)
x = -7
x = -7
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