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4*x-((3*x)/5)-20 = 2/5 // - 2/5
4*x-((3*x)/5)-(2/5)-20 = 0
4*x+(-3/5)*x-2/5-20 = 0
17/5*x-102/5 = 0 // + 102/5
17/5*x = 102/5 // : 17/5
x = 102/5/17/5
x = 6
x = 6
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