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Answer:
<h2>x = 19</h2>Step-by-step explanation:
There are the vertical angles. The vertical angles are congruent. Therefore we have the equation:
<em>add 8 to both sides</em>
<em>subtract 6x from both sides</em>
The answers are
D --> Boron family
H --> Halogens
A --> Alkali metals
I --> Noble gases
Hope this helps
