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