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7*x-(3*x)+5/9 = 113/9 // - 113/9
7*x-(3*x)+5/9-(113/9) = 0
7*x-3*x+5/9-113/9 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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