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z in (-oo:+oo)
(2/3)*z = 4.5 // - 4.5
(2/3)*z-4.5 = 0
2/3*z-4.5 = 0 // + 4.5
2/3*z = 4.5 // : 2/3
z = 4.5/2/3
z = 6.74999997
z = 6.74999997
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