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z in (-oo:+oo)
(13/12)*z+1/3 = 8/3 // - 8/3
(13/12)*z+1/3-(8/3) = 0
(13/12)*z+1/3-8/3 = 0
13/12*z-7/3 = 0 // + 7/3
13/12*z = 7/3 // : 13/12
z = 7/3/13/12
z = 28/13
z = 28/13
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