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