Verified Answer :

heyDB

K + 2/10 = 2/5

K = -2/10 + 2/5

K = -2/10 + 4/10

K = 2/10

K = 1/5

ValyRemus

\(\frac{2}{5}= \frac{2}{10}+k\) ⇒ \(\frac{2}{5}= \frac{2\div2}{10\div2}+k\)

\(\frac{2}{5}= \frac{1}{5}+k\) ⇒ \(k= \frac{2}{5}- \frac{1}{5}\)

\(\boxed { k= \frac{1}{5} }\)

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