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x in (-oo:+oo)
X-(63/2) = x+12/5 // - x+12/5
X-x-(63/2)-(12/5) = 0
X-x-63/2-12/5 = 0
X-x-339/10 = 0 // - X-339/10
-x = -(X-339/10) // * -1
x = X-339/10
x = X-339/10
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