write the sum and difference for the related facts

write the sum and difference for the related facts ? i am lost on what this means

9+6=

15-6=
in Algebra 1 Answers by

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1 Answer

line 1......9+6=15 . . .

then him take the anser (15)...15-6....

that is line 1 & subtrakt 6 from both sides

(15-6)=(9+6)-6
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