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Silversoul
Not sure what the question is.
9+2x=18
Subtract 9 from each side then...
   2x=9
Divide each side by 2 and you'll have that x is....
  
x=4.5

Not sure if I answered correctly.
heyDB
Since 9 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 9 from both sides.
2x=−9+18

Add −9 and 18 to get 9.
2x=9

Divide each term in the equation by 2.
x=9/2


Exact Form: 
9/2 

Decimal Form: 
4.5 

Mixed Number Form: 
4 1/2