**Complete to solve $13+ 7$.**
$\phantom{=}13+7$
$=(10+$ [[☃ input-number 1]]$)+7$
$=\,\,10 + ($$$[[☃ input-number 2]] $+7)$
$=\,\,10 + $ [[☃ input-number 3]]$$
$=$ [[☃ input-number 4]]
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