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