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x in (-oo:+oo)
X-x-(2/5)-(4/2) = 2 // - 2
X-x-(2/5)-(4/2)-2 = 0
X-x-2/5-2-2 = 0
X-x-22/5 = 0 // - X-22/5
-x = -(X-22/5) // * -1
x = X-22/5
x = X-22/5
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