Answer :

When dealing with inequalities your main goal is to isolate x. So you do whatever it takes to get X alone on one side.
4x+11<23
4x<12
x<3

x<3
First, you subtract the 11 from both sides of the equation:
 4x+11<23
     -11<-11
      4x<12
Next, divide both sides of the inequality by 4:
      4x<12
      4  < 4
        x<3

      

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