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z in (-oo:+oo)
(3/2)*z = (-3/2)*z+18 // - (-3/2)*z+18
(3/2)*z-((-3/2)*z)-18 = 0
(3/2)*z+(3/2)*z-18 = 0
3*z-18 = 0 // + 18
3*z = 18 // : 3
z = 18/3
z = 6
z = 6
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