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z in (-oo:+oo)
3*z-((1/2)*z) = z+10 // - z+10
3*z-((1/2)*z)-z-10 = 0
3*z+(-1/2)*z-z-10 = 0
3/2*z-10 = 0 // + 10
3/2*z = 10 // : 3/2
z = 10/3/2
z = 20/3
z = 20/3
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