(x-3) + (x+5) = 180°
2x + 2 = 180° --> Subtract 2 from both sides
2x = 178° --> Divide both sides by 2
x = 89°
☆Proof your answer☆
(89 - 3) + (89 + 5) = 180
86 + 94 = 180 ✅
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