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