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x in (-oo:+oo)
(3*x)/5-x = 4 // - 4
(3*x)/5-x-4 = 0
-2/5*x-4 = 0 // + 4
-2/5*x = 4 // : -2/5
x = 4/(-2/5)
x = -10
x = -10
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