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x in (-oo:+oo)
4*x-9 = x/4 // - x/4
4*x-(x/4)-9 = 0
15/4*x-9 = 0 // + 9
15/4*x = 9 // : 15/4
x = 9/15/4
x = 12/5
x = 12/5
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