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x in (-oo:+oo)
X+1/2 = 2*x-(1/5) // - 2*x-(1/5)
X-(2*x)+1/2+1/5 = 0
X-2*x+1/2+1/5 = 0
X-2*x+7/10 = 0 // - X+7/10
-2*x = -(X+7/10) // : -2
x = (-(X+7/10))/(-2)
x = (X+7/10)/2
x = (X+7/10)/2
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