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7*x-(5/9) = 20 // - 20
7*x-(5/9)-20 = 0
7*x-5/9-20 = 0
7*x-185/9 = 0 // + 185/9
7*x = 185/9 // : 7
x = 185/9/7
x = 185/63
x = 185/63
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