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x in (-oo:+oo)
(5*x)/6-((3*x)/7) = 1 // - 1
(5*x)/6-((3*x)/7)-1 = 0
(5*x)/6+(-3/7)*x-1 = 0
17/42*x-1 = 0 // + 1
17/42*x = 1 // : 17/42
x = 1/17/42
x = 42/17
x = 42/17
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