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z in (-oo:+oo)
(4/5)*(5*z-5) = 52 // - 52
(4/5)*(5*z-5)-52 = 0
4/5*(5*z-5)-52 = 0
4/5*(5*z-5)-52 = 0
4*z-56 = 0
4*z-56 = 0
4*z-56 = 0 // + 56
4*z = 56 // : 4
z = 56/4
z = 14
z = 14
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