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x in (-oo:+oo)
-x-(1/7) = x+1/4+1/7 // - x+1/4+1/7
-x-x-(1/7)-(1/4)-(1/7) = 0
-x-x-1/7-1/4-1/7 = 0
-2*x-15/28 = 0 // + 15/28
-2*x = 15/28 // : -2
x = 15/28/(-2)
x = -15/56
x = -15/56
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