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