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z in (-oo:+oo)
(2/3)*z = 4.25 // - 4.25
(2/3)*z-4.25 = 0
2/3*z-4.25 = 0 // + 4.25
2/3*z = 4.25 // : 2/3
z = 4.25/2/3
z = 6.37499997
z = 6.37499997
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