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x in (-oo:+oo)
-x-(1/7) = x+1/2+2/7 // - x+1/2+2/7
-x-x-(1/7)-(1/2)-(2/7) = 0
-x-x-1/7-1/2-2/7 = 0
-2*x-13/14 = 0 // + 13/14
-2*x = 13/14 // : -2
x = 13/14/(-2)
x = -13/28
x = -13/28
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