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x in (-oo:+oo)
x = 2*x-(8/5) // - 2*x-(8/5)
x-(2*x)+8/5 = 0
x-2*x+8/5 = 0
8/5-x = 0 // - 8/5
-x = -8/5 // * -1
x = 8/5
x = 8/5
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