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Mathematics 10 Online
OpenStudy (anonymous):

Figure JKLM shows the top surface of a box shaped as a rectangle with segment JL as its diagonal. The measure of angle KJL is (x + 7) degrees and the measure of angle MJL is (2x – 1) degrees. Which property of rectangles is used to write the equation (x + 7) + (2x – 1) = 90 and solve for x?

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