Answer:
0
Explanation:
If 4x + b = 4x, then b = ?
Let's solve!
4x + b = 4x
Minus 4x on both sides
b = 4x - 4x
b = 0
We can check, does 4x + 0 = 4x?
Yes, it works.
Hope this helps :)
Have a nice day!
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