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