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5*x-(3/7) = 4 // - 4
5*x-(3/7)-4 = 0
5*x-3/7-4 = 0
5*x-31/7 = 0 // + 31/7
5*x = 31/7 // : 5
x = 31/7/5
x = 31/35
x = 31/35
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