You do the things in the parentheses first then multiply them by 2

<h3><em>The </em><em>answer </em><em>is </em><em>option </em><em>a </em><em>.</em><em> </em><em>6</em><em>.</em><em>1</em></h3><h3 />
12=-12+x
or are you looking for something like you provided us in your question
"<span>(example 3x+4y=19 )"</span>
Answer: ex-1
Step-by-step explanation:
The -1 is used to show the parabola