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z in (-oo:+oo)
(4/324)*z = 4/324 // - 4/324
(4/324)*z-(4/324) = 0
(4/324)*z-1/81 = 0
1/81*z-1/81 = 0 // + 1/81
1/81*z = 1/81 // : 1/81
z = 1/81/1/81
z = 1
z = 1
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