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6*x-9 = 13/5-x // - 13/5-x
6*x+x-(13/5)-9 = 0
6*x+x-13/5-9 = 0
7*x-58/5 = 0 // + 58/5
7*x = 58/5 // : 7
x = 58/5/7
x = 58/35
x = 58/35
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