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x+12/3 = 9-(x/5)-1 // - 9-(x/5)-1
x+x/5+12/3-9+1 = 0
6/5*x-4 = 0 // + 4
6/5*x = 4 // : 6/5
x = 4/6/5
x = 10/3
x = 10/3
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