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3*x-(x/7)-(1/5) = 0
3*x-(x/7)-1/5 = 0
20/7*x-1/5 = 0 // + 1/5
20/7*x = 1/5 // : 20/7
x = 1/5/20/7
x = 7/100
x = 7/100
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