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z in (-oo:+oo)
18-((7*((18-(13*z))/7))/13) = 0
(-1/13)*(18-13*z)+18 = 0
18-1/13*(18-13*z) = 0
18-1/13*(18-13*z) = 0
z+216/13 = 0
z+216/13 = 0
z+216/13 = 0 // - 216/13
z = -216/13
z = -216/13
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