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4*x-(9/7) = 1 // - 1
4*x-(9/7)-1 = 0
4*x-9/7-1 = 0
4*x-16/7 = 0 // + 16/7
4*x = 16/7 // : 4
x = 16/7/4
x = 4/7
x = 4/7
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