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Answer:
x=21
Step-by-step explanation:
The sum of the angles of a triangle is 180
100 + 3x + x-4= 180
Combine like terms
100 -4 + 3x+x = 180
96+4x = 180
Sutract 96 from each side
96-96 +4x = 180-96
4x =84
Divide each side by 4
4x/4 = 84/4
x = 21