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z in (-oo:+oo)
z/5 = 5.4 // - 5.4
z/5-5.4 = 0
1/5*z-5.4 = 0 // + 5.4
1/5*z = 5.4 // : 1/5
z = 5.4/1/5
z = 27
z = 27
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