Answer:
x = 198
Step-by-step explanation:
To find our unknown number, we simply use algebra:
x + 400 = 598
Subtract both sides by 400
To fill in the blank just subtract
[tex]598-400=198[/tex]
To check add 198 and 400
[tex]400+198=598[/tex]
So, the answer is 198
Hope this helps
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