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x in (-oo:+oo)
X-(1/5) = x+1/4+2/5 // - x+1/4+2/5
X-x-(1/5)-(1/4)-(2/5) = 0
X-x-1/5-1/4-2/5 = 0
X-x-17/20 = 0 // - X-17/20
-x = -(X-17/20) // * -1
x = X-17/20
x = X-17/20
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