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