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x in (-oo:+oo)
x/2 = 12/3 // - 12/3
x/2-(12/3) = 0
x/2-4 = 0
1/2*x-4 = 0 // + 4
1/2*x = 4 // : 1/2
x = 4/1/2
x = 8
x = 8
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