Answer :

25°


Let the measure of an angle = X


Complement of X = 90° – X


Supplement of X = 180° – X


According to question,


7(90° – X) = 3(180° – X) - 10°


630° – 7X = 540° – 3X - 10°


– 7X + 3X = 540° – 10° – 630°


- 4X = 100°


X = 25°


Therefore measure of an angle = 25°


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