teaboot:20+40=60, 5+5=10, 3+2=5, 60+10=70, 70+5= [75] 7 + 8 = 15, so 5, carry the 12 + 4 + 1 = 7, so 75
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original: https://superchubly.tumblr.com/post/686874909138354176