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z in (-oo:+oo)
(3*z)/4-((2*z)/3)+1/2 = 5/6 // - 5/6
(3*z)/4-((2*z)/3)+1/2-(5/6) = 0
(3*z)/4+(-2/3)*z+1/2-5/6 = 0
1/12*z-1/3 = 0 // + 1/3
1/12*z = 1/3 // : 1/12
z = 1/3/1/12
z = 4
z = 4
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