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3*x-(1/5) = 4 // - 4
3*x-(1/5)-4 = 0
3*x-1/5-4 = 0
3*x-21/5 = 0 // + 21/5
3*x = 21/5 // : 3
x = 21/5/3
x = 7/5
x = 7/5
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