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5x = 180 - 80
5x = 100
x = 100 / 5
x = 20 derajat
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12x = 60
x = 60 / 12
x = 5 derajat
12x + x + 5y = 180
13x + 5y = 180
13(5) + 5y = 180
65 + 5y = 180
5y = 180 - 65
5y = 115
y = 115 / 5
y = 23 derajat