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1/10 = 3/20-(3*x) // - 3/20-(3*x)
3*x+1/10-(3/20) = 0
3*x+1/10-3/20 = 0
3*x-1/20 = 0 // + 1/20
3*x = 1/20 // : 3
x = 1/20/3
x = 1/60
x = 1/60
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