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Sagot :

Answer:

18

Step-by-step explanation:

So since the two lines are parallel, 3x is congruent to the angle to the left of 6x+18 and since the two angles together are a straight line it's equal to 180 degrees. So

6x + 18 + 3x = 180

9x + 18 = 180

9x = 162

x = 18