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langkah awal
• mencari nilai X
2x - 20 + 5x +3x = 180 ( 180 merupakan jumlah sudut segitiga )
10x - 20 = 180
10x = 180 + 20
10x = 200
x = 200/ 10
x = 20
ditnya sudut BAC
2x -20
2(20)-20
20
A.20