Question

Solve P=2I+2w for I.

Answer 1

1. Rewrite this statement according to the rule: term with l leave in the right side and terms without l write in the left side.

P-2w=2l.

2. Change left and right sides:

2l=P-2w.

3. Divide the whole equation by 2:

$l=\dfrac{P}{2}-\dfrac{2w}{2}=\dfrac{P}{2}-w.$

Answer: $l=\dfrac{P}{2}-w.$