Answer:
8
Explanation:
x+4=12, so 12-4=x (if you use an the inverse operation of addition, subtraction.)
12-4=x, so all you have to do is subtract and, there you have it, 8. It makes sense, 8+4=12. :)
x = 8
x + 4 = 12
x=12-4
x=8
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