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