Question

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Answer 1

x=57

Explanation:

The sum of the angles of a triangle add to 180 degrees

(x-5) + (2x-7) + 21 = 180

Combine like terms

3x +9 = 180

Subtract 9 from each side

3x+9-9= 180-9

3x = 171

Divide by 3

3x/3 =171/3

x =57