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