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7*x-2/5 = 243/5 // - 243/5
7*x-2/5-(243/5) = 0
7*x-2/5-243/5 = 0
7*x-49 = 0 // + 49
7*x = 49 // : 7
x = 49/7
x = 7
x = 7
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