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x in (-oo:+oo)
-x-(1/7) = x+1/2+1/7 // - x+1/2+1/7
-x-x-(1/7)-(1/2)-(1/7) = 0
-x-x-1/7-1/2-1/7 = 0
-2*x-11/14 = 0 // + 11/14
-2*x = 11/14 // : -2
x = 11/14/(-2)
x = -11/28
x = -11/28
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