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x in (-oo:+oo)
-x-(4/7) = x+1/4+4/7 // - x+1/4+4/7
-x-x-(4/7)-(1/4)-(4/7) = 0
-x-x-4/7-1/4-4/7 = 0
-2*x-39/28 = 0 // + 39/28
-2*x = 39/28 // : -2
x = 39/28/(-2)
x = -39/56
x = -39/56
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