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z in (-oo:+oo)
(1/2)*(z+2) = 4 // - 4
(1/2)*(z+2)-4 = 0
1/2*(z+2)-4 = 0
1/2*(z+2)-4 = 0
1/2*z-3 = 0
1/2*z-3 = 0
1/2*z-3 = 0 // + 3
1/2*z = 3 // : 1/2
z = 3/1/2
z = 6
z = 6
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