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z in (-oo:+oo)
z/4.5 = 15/5 // - 15/5
z/4.5-(15/5) = 0
z/4.5-3 = 0
0.22222222*z-3 = 0 // + 3
0.22222222*z = 3 // : 0.22222222
z = 3/0.22222222
z = 13.50000014
z = 13.50000014
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