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7*x-x+1/5 = 16/5 // - 16/5
7*x-x+1/5-(16/5) = 0
7*x-x+1/5-16/5 = 0
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x = 1/2
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