Question

P= a+b+c
solve for b​

Answer 1

`b = P - a - c`

Explanation:

Notice that there are 3 terms on the right hand side. You want to isolate b in order to solve for it.

I find it less confusing to place term containing the variable you want on the left hand side. (As long as it is positive).

`a + b + c = P`

To isolate b subtract a and c from both sides

`b = P -a - c`

Answer 2

Refer to the attached image.