53+8= 30-5= 1×1= 2×2-1= ( )×2=10
6×1= 5×5= 2+29= 3×4-5= ( )×4=12
5×4= 4×3= 3×3= 6+6+6= 3×( )=18
47-20= 2×4= 37-6= 5×2+3= 5×( )=5
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