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x in (-oo:+oo)
(1/2)*x = x+10 // - x+10
(1/2)*x-x-10 = 0
-1/2*x-10 = 0 // + 10
-1/2*x = 10 // : -1/2
x = 10/(-1/2)
x = -20
x = -20
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