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x in (-oo:+oo)
x/3 = 2/12 // - 2/12
x/3-(2/12) = 0
x/3-1/6 = 0
1/3*x-1/6 = 0 // + 1/6
1/3*x = 1/6 // : 1/3
x = 1/6/1/3
x = 1/2
x = 1/2
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