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x in (-oo:+oo)
x/2 = 9/3 // - 9/3
x/2-(9/3) = 0
x/2-3 = 0
1/2*x-3 = 0 // + 3
1/2*x = 3 // : 1/2
x = 3/1/2
x = 6
x = 6
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