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4*x+1 = 5*x+4/5 // - 5*x+4/5
4*x-(5*x)-(4/5)+1 = 0
4*x-5*x-4/5+1 = 0
1/5-x = 0 // - 1/5
-x = -1/5 // * -1
x = 1/5
x = 1/5
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