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x in (-oo:+oo)
1-(4*x) = 4*x+13/5 // - 4*x+13/5
1-(4*x)-(4*x)-(13/5) = 0
1-4*x-4*x-13/5 = 0
-8*x-8/5 = 0 // + 8/5
-8*x = 8/5 // : -8
x = 8/5/(-8)
x = -1/5
x = -1/5
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