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x in (-oo:+oo)
2/5-x = (1/2)*x+4/5 // - (1/2)*x+4/5
2/5-x-((1/2)*x)-(4/5) = 0
(-1/2)*x-x+2/5-4/5 = 0
-3/2*x-2/5 = 0 // + 2/5
-3/2*x = 2/5 // : -3/2
x = 2/5/(-3/2)
x = -4/15
x = -4/15
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