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