10 + 8 + 20 + 1 =
20 - 2 + 20 + 1
start on the right. 8+1=9 move to the left side. 1+2= 3. the solution to this problem is 39
go to the right.8+1=9
go to the left.1+2=3
it is 39.
18 + 21 = 39
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