Answer:
x+21°+x+2x-45=180°(angle sum property)
4x-24=180°
4x = 180+24
4x=204
x=204/4
x=51
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Answer:
x+21°+x+2x-45=180°(angle sum property)
4x-24=180°
4x = 180+24
4x=204
x=204/4
x=51