Question 1162239
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            It is about solving simple linear equation in one unknown --- one of simplest problems in Algebra.



<pre>
Step 1.  Subtract 2x from both sides.  You will get then

             2x + 8 = -12.


Step 2.  Subtract 8 from both sides.  You will get

             2x = -12 - 8,  or

             2x = - 20.


Step 3.  In the last equation, divide both sides by 2.  You will get

             x = -20/2 = -10.


It is what the problem asks to prove.
</pre>

The solution / (the proof) is completed.


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To learn the subject &nbsp;(on solving simple linear equations), &nbsp;see the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/How-to-solve-a-linear-equation.lesson>HOW TO solve a linear equation</A>

in this site.


This subject is one of the basic Algebra skills.