Answer :

heyDB
K + 2/10 = 2/5

K = -2/10 + 2/5

K = -2/10 + 4/10

K = 2/10

K = 1/5
ValyRemus
[tex] \frac{2}{5}= \frac{2}{10}+k [/tex] ⇒ [tex]\frac{2}{5}= \frac{2\div2}{10\div2}+k[/tex]

[tex] \frac{2}{5}= \frac{1}{5}+k[/tex] ⇒ [tex]k= \frac{2}{5}- \frac{1}{5} [/tex]

[tex]\boxed { k= \frac{1}{5} }[/tex]

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