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