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