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z in (-oo:+oo)
((7*z-8)/(64/8))^2 = 0
((7*z-8)^2)/(8^2) = 0
7*z-8 = 0 // + 8
7*z = 8 // : 7
z = 8/7
z in { 8/7, 8/7 }
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