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x in (-oo:+oo)
x/12 = 4/8 // - 4/8
x/12-(4/8) = 0
x/12-1/2 = 0
1/12*x-1/2 = 0 // + 1/2
1/12*x = 1/2 // : 1/12
x = 1/2/1/12
x = 6
x = 6
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