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x in (-oo:+oo)
(5/7)*x-8 = x // - x
(5/7)*x-x-8 = 0
-2/7*x-8 = 0 // + 8
-2/7*x = 8 // : -2/7
x = 8/(-2/7)
x = -28
x = -28
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