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x in (-oo:+oo)
(3*x)/7-8 = x // - x
(3*x)/7-x-8 = 0
-4/7*x-8 = 0 // + 8
-4/7*x = 8 // : -4/7
x = 8/(-4/7)
x = -14
x = -14
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