Question: What is the exact problem of this code?

> 

restart:

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``

> 

K__vxa[1] := 2.0154553049*10^17

0.2015455305e18

(1)
> 

`#mrow(mi("\`K__vxa\`"),mfenced(mn("1"),open = "[",close = "]"))`+K__vxa[1]

`#mrow(msub(mi("\`K"),mi("vxa\`")),mfenced(mn("1"),open = "[",close = "]"))`+0.2015455305e18

(2)
> 

``

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