Answer:
Explanation:
opposite angles = congruents
6x + 6 = 9x - 3
6 + 3 = 9x - 6x
9 = 3x
x = 9 : 3
x = 3
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check
6 * 3 + 6 = 9 * 3 - 3
18 + 6 = 27 - 3
24 = 24
the answer is good
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