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