Find the sum of angles kma and yma.

Ok, so we know that a straight line equals 180 degrees.

Therefore if we add the two equations together, we get:

(2x+7x)−3+21collect like terms
9x+18simplify

Then, we have to make the equation equal to 180:

9x+18=180
9x=162subtract 18
x=18divide 9

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