Answer:
x = 11
Explanation:
The sum of the angles of a triangle is 180 degrees
60 + 80 + 3x+7 = 180
Combine like terms
3x+147=180
Subtract 147 from each side
3x+147-147=180-147
3x = 33
Divide each side by 3
3x/3 = 33/3
the sum of the 3 angles in the triangle = 180°
sum the 3 angles and equate to 180
80 + 60 + 3x + 7 = 180
147 + 3x = 180 ( subtract 147 from both sides )
3x = 33 ( divide both sides by 3 )
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