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x in (-oo:+oo)
5-((1/2)*x) = -5 // + 5
5-((1/2)*x)+5 = 0
(-1/2)*x+5+5 = 0
10-1/2*x = 0 // - 10
-1/2*x = -10 // : -1/2
x = -10/(-1/2)
x = 20
x = 20
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