Penjelasan dengan langkah-langkah:
130°+(4x+10)=180°
140°+4x=180°
4x=180°-140°
x=40/4
x=10
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Penjelasan dengan langkah-langkah:
130°+(4x+10)=180°
140°+4x=180°
4x=180°-140°
x=40/4
x=10