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z in (-oo:+oo)
6*z = 4*((1/2)*z-8) // - 4*((1/2)*z-8)
6*z-(4*((1/2)*z-8)) = 0
6*z-4*((1/2)*z-8) = 0
6*z-4*(1/2*z-8) = 0
6*z-4*(1/2*z-8) = 0
4*z+32 = 0
4*z+32 = 0
4*z+32 = 0 // - 32
4*z = -32 // : 4
z = -32/4
z = -8
z = -8
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