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x in (-oo:+oo)
(5*x)/7-4 = x // - x
(5*x)/7-x-4 = 0
-2/7*x-4 = 0 // + 4
-2/7*x = 4 // : -2/7
x = 4/(-2/7)
x = -14
x = -14
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