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z in (-oo:+oo)
4*5*z-((1/2)*z) = 234 // - 234
4*5*z-((1/2)*z)-234 = 0
4*5*z+(-1/2)*z-234 = 0
39/2*z-234 = 0 // + 234
39/2*z = 234 // : 39/2
z = 234/39/2
z = 12
z = 12
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