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x in (-oo:+oo)
18-x = (1/2)*x // - (1/2)*x
18-x-((1/2)*x) = 0
(-1/2)*x-x+18 = 0
18-3/2*x = 0 // - 18
-3/2*x = -18 // : -3/2
x = -18/(-3/2)
x = 12
x = 12
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