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Answer:
[tex]\huge\boxed{\sf c = 62\°}[/tex]
Step-by-step explanation:
c + 135 + 87 + 76 = 360° (Angles at a point add up to 360°)
c + 298 = 360
Subtract 298 to both sides
c = 360 - 298
c = 62°
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!