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To find the value of x, you need to use the fact that supplementary angles add up to 180 degrees.
So, we can write the equation:
128° + 5x° = 180°
Subtract 128 from both sides:
5x° = 52°
Now divide by 5:
x = 52/5
x = 10.4
Therefore, the value of x is 10.4.