**Complete to solve $18 + 704$.**
$\phantom{=}18+704$
$=(12+$ [[☃ math-keypad 1]]$)+ 704$
$=12 + ($[[☃ math-keypad 2]] $+ 704)$
$=12 + $ [[☃ math-keypad 3]]
$=$ [[☃ math-keypad 4]]
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