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Answer:
A
Step-by-step explanation:
Khan gives you right answer and tells you what's wrong, but this site is for help so, all you need to do is use the destructive property.
12 x 2= 24 12 x 3 = 36 12 x -1 = -12
now you have the original expression, 24 + 36 - 12 (without the letters.)