Question 269920
Hello, 
Let's take it step by step: (Note: we'll be solving for "r" not "x")
7[2-(3+4r]=-9+2(1-5r)
7[-1-4r]=-9+2(1-5r) Notice this step was corrected.
7[-1-4r] = -9+2-10r This step is corrected also.
-7-28r= -7 -10r From this step add 7 to both sides to get:
-28r=-10r Now add 10 r to both sides to get:
-18r=0 Divide both sides by -18 to result in:
r=0
Plug 0 into the original equation to see if it works.
Make more sense? 
RJ 
There's a book I wrote that might help:
www.math-unlock.com