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[tex]\\ \sf\longmapsto x+88+100+118=360[/tex]
[tex]\\ \sf\longmapsto x+188+118=360[/tex]
[tex]\\ \sf\longmapsto x+306=360[/tex]
[tex]\\ \sf\longmapsto x=360-306[/tex]
[tex]\\ \sf\longmapsto x=54[/tex]
Answer:
54
Step-by-step explanation:
118+100+88=306
360-306=54
All quadrilaterals angle measures always add up to 360 degrees.