Answer: x-9
Step-by-step explanation: To get rid of the parentheses you must distribute or multiply the -3 to all the numbers inside the parentheses.
-3(x+3)+4x
-3x-9+4x
Then we combine like terms which will give us our answer.
-3x-9+4x
x-9
Since this is an expression and not an equation there will not be a result. We are only simplifying the expression.
So the final answer is
x-9 Hope this helps!