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x in (-oo:+oo)
x/2+1 = 2*x-(1/5) // - 2*x-(1/5)
x/2-(2*x)+1/5+1 = 0
x/2-2*x+1/5+1 = 0
6/5-3/2*x = 0 // - 6/5
-3/2*x = -6/5 // : -3/2
x = -6/5/(-3/2)
x = 4/5
x = 4/5
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