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x in (-oo:+oo)
-x-(2/7) = x+1/4+4/7 // - x+1/4+4/7
-x-x-(2/7)-(1/4)-(4/7) = 0
-x-x-2/7-1/4-4/7 = 0
-2*x-31/28 = 0 // + 31/28
-2*x = 31/28 // : -2
x = 31/28/(-2)
x = -31/56
x = -31/56
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