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Jo Kristian Bergum · Answer 1 · 2017-11-21T19:10:51+0000

Hi there, well the opposite of subtraction is addition. So we are going to add 2/5 by 1/5. 2/5+1/5=3/5, to check if we are right we do 3/5-1/5 and that would equal 1/5. Therefore, X=3/5

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