exam Maths Puzzle Numerical Ability

I need help writing a formula for: The sum S of the measures of angles in a polygon of n sides.

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exam Other Question

My teacher is not very good at explaining the lessons to me.
I do not get the concept of dividing exponents.
PLEASE HELP ME! x + 2y - 7z = -1
3x + 7y - 24z = 6
x + 4y - 12z = 26