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