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5. 68 derajat
6. 80 derajat + 5x derajat = 180 derajat maka x= 20 derajat
7. x = 5 derajat jadi 13x+5y=180 = 13.5+5y=180, 65+5y = 180, 5y=115, y=23
8.75 derajat