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80*x-(8*x)-20 = 3/5 // - 3/5
80*x-(8*x)-(3/5)-20 = 0
80*x-8*x-3/5-20 = 0
72*x-103/5 = 0 // + 103/5
72*x = 103/5 // : 72
x = 103/5/72
x = 103/360
x = 103/360
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