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z in (-oo:+oo)
13*z-((6/18)*(z-1)) = 0
(-1/3)*(z-1)+13*z = 0
13*z-1/3*(z-1) = 0
13*z-1/3*(z-1) = 0
38/3*z+1/3 = 0
38/3*z+1/3 = 0
38/3*z+1/3 = 0 // - 1/3
38/3*z = -1/3 // : 38/3
z = -1/3/38/3
z = -1/38
z = -1/38
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