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4*x-(2/5) = 10 // - 10
4*x-(2/5)-10 = 0
4*x-2/5-10 = 0
4*x-52/5 = 0 // + 52/5
4*x = 52/5 // : 4
x = 52/5/4
x = 13/5
x = 13/5
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