Respuesta :

Answer: x=35

The supplementary angle with 40 and 40 degrees tells me the triangles angle is 100 degrees (40 + 40 + 100 = 180 degree)

2x + 30 = 100
-30 -30 subtract 30 from both sides
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2x = 70 Divide both sides by 2 to isolate x

X = 35