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kalo betul berarti
2x + 10 + 5x - 5 = 180 derajat
7x - 5 = 180
7x = 175
x = 25 derajat
sorii ya dee, tadi salah baca :)
7x + 5 = 180
7x = 180 - 5
7x = 175
x = 175 : 7
x = 25
maaf yaa kalau salah