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x in (-oo:+oo)
x/18 = 9/2 // - 9/2
x/18-(9/2) = 0
x/18-9/2 = 0
1/18*x-9/2 = 0 // + 9/2
1/18*x = 9/2 // : 1/18
x = 9/2/1/18
x = 81
x = 81
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