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4*x+2/5 = 122/5 // - 122/5
4*x+2/5-(122/5) = 0
4*x+2/5-122/5 = 0
4*x-24 = 0 // + 24
4*x = 24 // : 4
x = 24/4
x = 6
x = 6
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