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z in (-oo:+oo)
z+5 = 3*z+2/4+4 // - 3*z+2/4+4
z-(3*z)-(2/4)-4+5 = 0
z-3*z-1/2-4+5 = 0
1/2-2*z = 0 // - 1/2
-2*z = -1/2 // : -2
z = -1/2/(-2)
z = 1/4
z = 1/4
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