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5*x-(4/5) = 171/5 // - 171/5
5*x-(4/5)-(171/5) = 0
5*x-4/5-171/5 = 0
5*x-35 = 0 // + 35
5*x = 35 // : 5
x = 35/5
x = 7
x = 7
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