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x in (-oo:+oo)
(5*x)/6-((4*x)/7) = 1 // - 1
(5*x)/6-((4*x)/7)-1 = 0
(5*x)/6+(-4/7)*x-1 = 0
11/42*x-1 = 0 // + 1
11/42*x = 1 // : 11/42
x = 1/11/42
x = 42/11
x = 42/11
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