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z in (-oo:+oo)
6*z = 4*((1/2)*z-6) // - 4*((1/2)*z-6)
6*z-(4*((1/2)*z-6)) = 0
6*z-4*((1/2)*z-6) = 0
6*z-4*(1/2*z-6) = 0
6*z-4*(1/2*z-6) = 0
4*z+24 = 0
4*z+24 = 0
4*z+24 = 0 // - 24
4*z = -24 // : 4
z = -24/4
z = -6
z = -6
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