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z in (-oo:+oo)
z/27 = 10/9 // - 10/9
z/27-(10/9) = 0
z/27-10/9 = 0
1/27*z-10/9 = 0 // + 10/9
1/27*z = 10/9 // : 1/27
z = 10/9/1/27
z = 30
z = 30
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