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x in (-oo:+oo)
-x-4 = 4*x-(58/7) // - 4*x-(58/7)
58/7-x-(4*x)-4 = 0
58/7-x-4*x-4 = 0
30/7-5*x = 0 // - 30/7
-5*x = -30/7 // : -5
x = -30/7/(-5)
x = 6/7
x = 6/7
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