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Mathematics, 09.01.2021 17:50 nichelle2807

D+c+a=12
b+d+c=14
a+d+b=16
c+a+b=18
a+b=?

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D+c+a=12
b+d+c=14
a+d+b=16
c+a+b=18
a+b=?...

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