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[tex]5x + 4x + 5x + 4x = 360[/tex]
[tex]18x = 360[/tex]
Divide sides by 18
[tex] \frac{18x}{18} = \frac{360}{18} \\ [/tex]
[tex]x = 20[/tex]
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[tex]4(x) = 4(20) = 80°[/tex]
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[tex]5x = 5(20) = 100°[/tex]
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