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