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1/20-(1/2) = x+3/5 // - x+3/5
1/20-x-(1/2)-(3/5) = 0
1/20-x-1/2-3/5 = 0
-x-21/20 = 0 // + 21/20
-x = 21/20 // * -1
x = -21/20
x = -21/20
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