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z in (-oo:+oo)
z/5-7 = 3.75 // - 3.75
z/5-7-3.75 = 0
1/5*z-10.75 = 0 // + 10.75
1/5*z = 10.75 // : 1/5
z = 10.75/1/5
z = 53.75
z = 53.75
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