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Sofia owes her brother $25 .She gives her brother the $18 she earned dog sitting. Write an addition expression to describe this situation. Find the sum also.



Answer :

Would it be:   

25=18+x
25-18=x
7=x so she still owes him $7
You are trying to find the unknown. x=unknown So.... 18+x =$25 Bring the 18 over to the other side and subtract, so.... x= 25-18 Therefore.... x=7

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