Answer:4.5
Step-by-step explanation: The answer is 4.5 because if you subtract 9.9 from 5.4 you get 4.5. You can also check this by putting the number for x. So 4.5 + 5.4 equals 9.9.
Explanation:
9.9 = x + 5.4
x = 9.9 -5.4
x = 4.5
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