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x in (-oo:+oo)
2*x+5/5 = 2*x+9/9 // - 2*x+9/9
2*x-(2*x)+5/5-(9/9) = 0
2*x-2*x+5/5-1 = 0
0 = 0
x naleu017Cy do R
x in (-oo:+oo)
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