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3x + 138° = 180°
3x = 180° - 138°
3x = 42°
x =
x = 14
Semoga Membantu...
Maka kedua sudut itu punya jumlah 180 derajat.
3x+5+133 = 180
3x+138 = 180
3x = 180-138
3x =42
x = 42/3
x = 14 derajat