Answer :

17 and 10/ 17+10=27 17-10=7
dannielle
a+b=27
a-b=7 
if we sum these
a+b+a-b=27+7=34
2a=34 ⇒ a=34/2 ⇒a=17
b=27-a=27-17 ⇒ b=10

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