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