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To find out the value of x:

x=12-7 (7 is transposed, therefore changing in sign)

To check:
5+7=12 (substitute the value)
12=12 true
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In order to find x in the equation x+7=12, just apply Subtraction Property of Equality, meaning subtract 7 to both sides of the equation, x+(7-7)=12-7, and will give you x=5. So 5 is the answer.
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