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x in (-oo:+oo)
1/2-(2*x) = -5/22 // + -5/22
1/2-(2*x)-(-5/22) = 0
1/2-2*x+5/22 = 0
8/11-2*x = 0 // - 8/11
-2*x = -8/11 // : -2
x = -8/11/(-2)
x = 4/11
x = 4/11
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