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x in (-oo:+oo)
1/5-2*x = 11/30 // - 11/30
1/5-2*x-(11/30) = 0
1/5-2*x-11/30 = 0
-2*x-1/6 = 0 // + 1/6
-2*x = 1/6 // : -2
x = 1/6/(-2)
x = -1/12
x = -1/12
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