SOLUTION:
Step 1:
In this question, we are given the following question:
[tex]\begin{gathered} P\text{ =a +b + c} \\ We\text{ are asked to solve for b} \end{gathered}[/tex]Step 2:
Solving for b, we have that:
[tex]b\text{ =P -a -c}[/tex]CONCLUSION:
The final answer is:
[tex]b\text{ = P-a-c}[/tex]