The answer is 10 but I got 12.5. can someone walk me through how to do this step by step?

x = 10.

Explanation:

Remember that all interior angles in a triangle add to 180 degrees.

Also remember that the angle measures on one side of a line add to 180 degrees. You can represent the third interior angle as 180 - (12x - 5).

Using that representation, we can solve for x:

180 - (12x - 5) is the first degree measure

68 is the second degree measure

4x + 7 is the third degree measure.

Simplifying this, we get

x = 10.

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