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