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Story Problem:
Sally had some money in her piggy bank. She received $10 for her birthday and put it in her piggy bank. Now she has $25 in her piggy bank. How much money did Sally have in her piggy bank before her birthday?
Equation:
x + 10 = 25
Property Used:
To solve the problem, we can use the subtraction property of equality.
Solution:
x + 10 - 10 = 25 - 10
x = 15
Therefore, Sally had $15 in her piggy bank before her birthday.