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x in (-oo:+oo)
x/5+x/7 = 6/5 // - 6/5
x/5+x/7-(6/5) = 0
x/5+x/7-6/5 = 0
12/35*x-6/5 = 0 // + 6/5
12/35*x = 6/5 // : 12/35
x = 6/5/12/35
x = 7/2
x = 7/2
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