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x in (-oo:+oo)
3*x-x-(6/2) = 3/2 // - 3/2
3*x-x-(6/2)-(3/2) = 0
3*x-x-3/2-3 = 0
2*x-9/2 = 0 // + 9/2
2*x = 9/2 // : 2
x = 9/2/2
x = 9/4
x = 9/4
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