Explicación paso a paso:
[tex]40 + x + x + 20 = 180 \\ 2x + 60 = 180 \\ 2x = 120 \\ x = 60[/tex]
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Explicación paso a paso:
[tex]40 + x + x + 20 = 180 \\ 2x + 60 = 180 \\ 2x = 120 \\ x = 60[/tex]