Hi there! :)
<em><u>Answer:</u></em>
<em><u>B. Multiplication Property of equality.</u></em>
<em><u>x=12</u></em>
<em><u>*The answer must have a positive sign.*</u></em>
Step-by-step explanation:
First, you divide by 6 from both sides of an equation.

And then, you simplify and solve. Then you divide by the numbers from left too right.

Answer: 
Hope this helps!