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z in (-oo:+oo)
4*(z+2/3) = 16/3 // - 16/3
4*(z+2/3)-(16/3) = 0
4*(z+2/3)-16/3 = 0
(3*4*(z+2/3))/3-16/3 = 0
3*4*(z+2/3)-16 = 0
12*z-8 = 0
(12*z-8)/3 = 0
(12*z-8)/3 = 0 // * 3
12*z-8 = 0
12*z-8 = 0 // + 8
12*z = 8 // : 12
z = 8/12
z = 2/3
z = 2/3
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