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z in (-oo:+oo)
16-((2*z-4)/3) = 0
(-1*(2*z-4))/3+16 = 0
(-1*(2*z-4))/3+(3*16)/3 = 0
3*16-1*(2*z-4) = 0
52-2*z = 0
(52-2*z)/3 = 0
(52-2*z)/3 = 0 // * 3
52-2*z = 0
52-2*z = 0 // - 52
-2*z = -52 // : -2
z = -52/(-2)
z = 26
z = 26
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