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4*x-(1/5) = 7 // - 7
4*x-(1/5)-7 = 0
4*x-1/5-7 = 0
4*x-36/5 = 0 // + 36/5
4*x = 36/5 // : 4
x = 36/5/4
x = 9/5
x = 9/5
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