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x in (-oo:+oo)
-x-(1/7) = x+1/4+2/7 // - x+1/4+2/7
-x-x-(1/7)-(1/4)-(2/7) = 0
-x-x-1/7-1/4-2/7 = 0
-2*x-19/28 = 0 // + 19/28
-2*x = 19/28 // : -2
x = 19/28/(-2)
x = -19/56
x = -19/56
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