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x in (-oo:+oo)
9 = (1/2)*x // - (1/2)*x
9-((1/2)*x) = 0
(-1/2)*x+9 = 0
9-1/2*x = 0 // - 9
-1/2*x = -9 // : -1/2
x = -9/(-1/2)
x = 18
x = 18
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