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x in (-oo:+oo)
(2*x)/5-(x/7) = 9/7 // - 9/7
(2*x)/5-(x/7)-(9/7) = 0
(2*x)/5-(x/7)-9/7 = 0
9/35*x-9/7 = 0 // + 9/7
9/35*x = 9/7 // : 9/35
x = 9/7/9/35
x = 5
x = 5
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