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7*x-2/5 = 31/10 // - 31/10
7*x-2/5-(31/10) = 0
7*x-2/5-31/10 = 0
7*x-7/2 = 0 // + 7/2
7*x = 7/2 // : 7
x = 7/2/7
x = 1/2
x = 1/2
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