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x in (-oo:+oo)
5-((1/2)*x) = -9 // + 9
5-((1/2)*x)+9 = 0
(-1/2)*x+5+9 = 0
14-1/2*x = 0 // - 14
-1/2*x = -14 // : -1/2
x = -14/(-1/2)
x = 28
x = 28
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