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x in (-oo:+oo)
18 = (1*4*x)/2 // - (1*4*x)/2
18-((1*4*x)/2) = 0
18-2*x = 0
18-2*x = 0 // - 18
-2*x = -18 // : -2
x = -18/(-2)
x = 9
x = 9
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