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To solve for x, simplify both sides of the equation and then isolate the variable:

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Answer:
The Solution to the Sum
Your solution after multiplying the 3 with the 180 degrees is 540 degrees. This is true for any pentagon you have. Regular pentagons where all the sides and angles are the same will have a sum of interior angles of 540 degrees.
PLEASE SAID THANKS
It is the first answer choice because a negative times a negative is a positive.