Question

3r+6-r+2=3r-r+6+2=3+6+2=11

Answer 1

Move everything to the same side to make the equation equal zero
3r+6-r+2-3r+r-6-2-3-6-2-11=0
Collect like terms.
3r-r-3r+r+6+2-6-2-3-6-2-11=0
Solve
3r-r-3r+r=0
R=0, so just add the other numbers for the solution
6+2-6-2-3-6-2-11=-22