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z in (-oo:+oo)
z/6.2 = 4.5 // - 4.5
z/6.2-4.5 = 0
0.16129032*z-4.5 = 0 // + 4.5
0.16129032*z = 4.5 // : 0.16129032
z = 4.5/0.16129032
z = 27.90000045
z = 27.90000045
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