Start by distributing the 3: 
(3)(x)+(3)(−2)=22-x
Now we have: 
3x−6=−x+22
Add x to both sides:
Add x to both sides.
3x−6+x=−x+22+x
Now we have:4x−6=22
Add 6 to both sides:
Add x to both sides.
3x−6+x=−x+22+x
4x−6+6=22+6
Now we have 
4x=28
Divide both sides by 4 
x=7
One solution