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z in (-oo:+oo)
(5*z)/6-((5*z)/7) = 1 // - 1
(5*z)/6-((5*z)/7)-1 = 0
(5*z)/6+(-5/7)*z-1 = 0
5/42*z-1 = 0 // + 1
5/42*z = 1 // : 5/42
z = 1/5/42
z = 42/5
z = 42/5
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