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x in (-oo:+oo)
-x-(4/7) = x-(1/4)+4/7 // - x-(1/4)+4/7
1/4-x-x-(4/7)-(4/7) = 0
1/4-x-x-4/7-4/7 = 0
-2*x-25/28 = 0 // + 25/28
-2*x = 25/28 // : -2
x = 25/28/(-2)
x = -25/56
x = -25/56
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