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z in (-oo:+oo)
(1/4)*z-(2/3) = 7/3 // - 7/3
(1/4)*z-(2/3)-(7/3) = 0
(1/4)*z-2/3-7/3 = 0
1/4*z-3 = 0 // + 3
1/4*z = 3 // : 1/4
z = 3/1/4
z = 12
z = 12
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