Ineed asap! i'm confused can someone explain this to me. ( you )

7.) Solve for w (isolate w)

P = 2L + 2W        Subtract 2L on both sides

P - 2L = 2W           Divide 2 on both sides

  You can simplify it to this(but idk if you have to):

You could have also done it this way:

P = 2L + 2W    Factor out 2

P = 2(L + W)  Divide 2 on both sides

    Subtract L on both sides

8.) Solve for t

D = rt      Divide r on both sides

9.) Solve for C

  Subtract 32 on both sides

        Multiply 5/9 on both sides to get rid of 9/5