Question 15218
I'm guessing the problem is 
{{{r/-3 + 6-1=2}}}
first thing you do is try to isolate the variable term. 6-1=5, 2-5=-3
{{{r/-3 = -3}}}
Then you can multiple both sides by -3, because {{{r/-3*-3=r}}}
{{{r = 9}}}