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[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

As we know, the sum of measures of interior angles of a triangle sum up to 180°

so, according to above question ~

  • [tex]x + 20 + x + 10 + x = 180[/tex]

  • [tex]3x + 30 = 180[/tex]

  • [tex] 3x = 180 - 30[/tex]

  • [tex]3x = 150[/tex]

  • [tex]x = 150 \div 3[/tex]

  • [tex]x = 50[/tex]
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