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z in (-oo:+oo)
z/12 = 3/9 // - 3/9
z/12-(3/9) = 0
z/12-1/3 = 0
1/12*z-1/3 = 0 // + 1/3
1/12*z = 1/3 // : 1/12
z = 1/3/1/12
z = 4
z = 4
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