0
Anonymous
(21-21)+(21-21)+21 = 0+0+21 = 21
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2121 = 5.842587018*1027
6+15=2121/5=4.2
421 + 2 + 3 + 4 + 5 + 6= 2121+21=42
4x-11=21 +11 +114x=32/4 /4x=8CHECK:4(8)-11=2132-11=2121=21
21