Penjelasan dengan langkah-langkah:
4x°+(4x-15)°+(2x-9)° = 180
10x°-24° = 180
10x° = 204
x = 20,4°
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Penjelasan dengan langkah-langkah:
4x°+(4x-15)°+(2x-9)° = 180
10x°-24° = 180
10x° = 204
x = 20,4°