Răspuns:
[tex] \color{red}unghiuri \: in \: jurul \: unui \: punct = 360 \: grade[/tex]
[tex]2x + 30 + x + x + 50 + 3x = 360 \\ 2x + x + x + 3x + 50 + 30 = 360 \\ 7x + 80 = 360 \\ 7x = 360 - 80 \\ 7x = 280 \\ x = 280 \div 7 \\ x = 40[/tex]
…ᘛ⁐̤ᕐᐷฅ^•ﻌ•^ฅฅ^•ﻌ•^ฅ
