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z in (-oo:+oo)
(2/9)*z-3 = 12 // - 12
(2/9)*z-12-3 = 0
2/9*z-15 = 0 // + 15
2/9*z = 15 // : 2/9
z = 15/2/9
z = 135/2
z = 135/2
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