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x in (-oo:+oo)
(1/5)*x-2 = x-4 // - x-4
(1/5)*x-x-2+4 = 0
2-4/5*x = 0 // - 2
-4/5*x = -2 // : -4/5
x = -2/(-4/5)
x = 5/2
x = 5/2
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