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5*x-(10/7) = 3 // - 3
5*x-(10/7)-3 = 0
5*x-10/7-3 = 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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