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z in (-oo:+oo)
z/6 = 9/4.5 // - 9/4.5
z/6-(9/4.5) = 0
z/6-2 = 0
1/6*z-2 = 0 // + 2
1/6*z = 2 // : 1/6
z = 2/1/6
z = 12
z = 12
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