To get your answer, you need to know how to get x by itslef.
Do not add or multiply 11 to 2x and x because 2x + x is not in parentheses. Instead, add 2x and x because they are the same variable.
2x + x is basically 2x + 1x because x is 1 of x.
You will get 3x. So the equation will look like this: 11 + 3x =23
Next, you need to subtract 11 from both sides. 11 will cancel out on the left side and on the right, it will become 12.
Equation so far: 3x = 12. Now you need to divide 3 from both sides. You will divide because you need to get x by itself. 3x divided by 3 = x because the 3 cancels out. And 12 divided by 3 = 4.
Your answer will be x = 4. To check it, you need to plug 4 (which is x) into the original equation 11+2(4)+(4) = 23