find the value of x and find all the angle of the triangle
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- so 1st angle=>3x+10. 3×7+10=21+10=31°
- so 1st angle=>3x+10. 3×7+10=21+10=31°2nd angle=>5x-9. 5×7-9=35-9=26°
- so 1st angle=>3x+10. 3×7+10=21+10=31°2nd angle=>5x-9. 5×7-9=35-9=26°3rd angle=>180-x-50. 180-7-50=180-57=123°
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