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2*x-(2/5)+10 = 20 // - 20
2*x-(2/5)-20+10 = 0
2*x-2/5-20+10 = 0
2*x-52/5 = 0 // + 52/5
2*x = 52/5 // : 2
x = 52/5/2
x = 26/5
x = 26/5
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