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x in (-oo:+oo)
1/2-(x/5) = 2*x-(5/5) // - 2*x-(5/5)
1/2-(x/5)-(2*x)+5/5 = 0
1/2-(x/5)-2*x+5/5 = 0
3/2-11/5*x = 0 // - 3/2
-11/5*x = -3/2 // : -11/5
x = -3/2/(-11/5)
x = 15/22
x = 15/22
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