Vertical angles are congruent, meaning they have the same measure. Therefore, we can set the two expressions equal to each other and solve for x:
9x + 3 = 12x - 6
Subtract 9x from both sides:
3 = 3x - 6
Add 6 to both sides:
9 = 3x
Divide both sides by 3:
x = 3
Therefore, x = 3.
The measure of two verticle angles are 9x + 3 and 12x - 6. Find x.(1 point)
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