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x in (-oo:+oo)
x/2 = 6/4 // - 6/4
x/2-(6/4) = 0
x/2-3/2 = 0
1/2*x-3/2 = 0 // + 3/2
1/2*x = 3/2 // : 1/2
x = 3/2/1/2
x = 3
x = 3
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