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x in (-oo:+oo)
-x-8 = 7*x-(104/7) // - 7*x-(104/7)
104/7-x-(7*x)-8 = 0
104/7-x-7*x-8 = 0
48/7-8*x = 0 // - 48/7
-8*x = -48/7 // : -8
x = -48/7/(-8)
x = 6/7
x = 6/7
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