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z in (-oo:+oo)
z+z = (1/2)*z+4 // - (1/2)*z+4
z+z-((1/2)*z)-4 = 0
z+z+(-1/2)*z-4 = 0
3/2*z-4 = 0 // + 4
3/2*z = 4 // : 3/2
z = 4/3/2
z = 8/3
z = 8/3
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