Answer:
x = 10.
Explanation:
As the 2 angles at the vertex are congruent we can say that:
12 / 3x + 2 = 9 / (33-9)
12/3x+2 = 9/24 = 3/8
3(3x+2) = 12*8
9x + 6 = 96
9x = 90
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