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x in (-oo:+oo)
3*x = 9/4 // - 9/4
3*x-(9/4) = 0
3*x-9/4 = 0
3*x-9/4 = 0 // + 9/4
3*x = 9/4 // : 3
x = 9/4/3
x = 3/4
x = 3/4
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