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z in (-oo:+oo)
3-((2*z)/9) = 15-((2*z)/3) // - 15-((2*z)/3)
(2*z)/3-((2*z)/9)-15+3 = 0
(-2/9)*z+(2*z)/3-15+3 = 0
4/9*z-12 = 0 // + 12
4/9*z = 12 // : 4/9
z = 12/4/9
z = 27
z = 27
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