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x in (-oo:+oo)
x/7+x/5 = 9/7 // - 9/7
x/7+x/5-(9/7) = 0
x/7+x/5-9/7 = 0
12/35*x-9/7 = 0 // + 9/7
12/35*x = 9/7 // : 12/35
x = 9/7/12/35
x = 15/4
x = 15/4
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