First you need to distribute to everything in the parentheses.
3x+9-4=1x+27
Combine like terms
3x+5=x+27
isolate variable
3x+5=x+27
-x -x
2x+5=27
Whatever you do to one side do to the other so I subtract x from both sides. then you must subtract 5 from both sides
2x+5=27
-5 -5
2x=22
divide by 2
2x=22
/2 /2
x=11
Hope that helped