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5*x+3/7 = 178/7 // - 178/7
5*x+3/7-(178/7) = 0
5*x+3/7-178/7 = 0
5*x-25 = 0 // + 25
5*x = 25 // : 5
x = 25/5
x = 5
x = 5
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