Answer:
149°
Explanation:
let the remaining side of the triangle a,
now,
63°+86°+a=180°(sum of angles of a triangle)
149°+a=180°
a=180°-149°
a=51°
again,
x+a=180°(being linear pair)
x+51°=180°
x=180°-51°
•°•x=149°
180
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