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x in (-oo:+oo)
3-((1/2)*x) = -5 // + 5
3-((1/2)*x)+5 = 0
(-1/2)*x+3+5 = 0
8-1/2*x = 0 // - 8
-1/2*x = -8 // : -1/2
x = -8/(-1/2)
x = 16
x = 16
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