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x in (-oo:+oo)
(4*x)/2 = 9/4 // - 9/4
(4*x)/2-(9/4) = 0
(4*x)/2-9/4 = 0
2*x-9/4 = 0 // + 9/4
2*x = 9/4 // : 2
x = 9/4/2
x = 9/8
x = 9/8
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