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x in (-oo:+oo)
12*x-(x/2) = 3 // - 3
12*x-(x/2)-3 = 0
23/2*x-3 = 0 // + 3
23/2*x = 3 // : 23/2
x = 3/23/2
x = 6/23
x = 6/23
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