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