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z in (-oo:+oo)
(13/12)*z = 1/4-(13/9) // - 1/4-(13/9)
(13/12)*z-(1/4)+13/9 = 0
(13/12)*z-1/4+13/9 = 0
13/12*z+43/36 = 0 // - 43/36
13/12*z = -43/36 // : 13/12
z = -43/36/13/12
z = -43/39
z = -43/39
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