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x in (-oo:+oo)
(3*x)/5-((3*x)/7) = 1 // - 1
(3*x)/5-((3*x)/7)-1 = 0
(3*x)/5+(-3/7)*x-1 = 0
6/35*x-1 = 0 // + 1
6/35*x = 1 // : 6/35
x = 1/6/35
x = 35/6
x = 35/6
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