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z in (-oo:+oo)
z/5 = 5.1 // - 5.1
z/5-5.1 = 0
1/5*z-5.1 = 0 // + 5.1
1/5*z = 5.1 // : 1/5
z = 5.1/1/5
z = 25.5
z = 25.5
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