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z in (-oo:+oo)
z/5-5 = 2.25 // - 2.25
z/5-5-2.25 = 0
1/5*z-7.25 = 0 // + 7.25
1/5*z = 7.25 // : 1/5
z = 7.25/1/5
z = 36.25
z = 36.25
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