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The degree of a line is 180, so..

Put it into an equation form: 5x + 75 = 180

1st combine like terms by subtracting 75 from 180

now your equation looks like this: 5x = 105

next you divide 5 from both sides, 105 divided by 5 is 21, so your answer is: x=21

I hope this helps!♥