Question

Solve the equation for w:

P = 2l + 2w; for w

Answer 1

Its 2L

Answer 2

P=2l+2w

Since w is on the right-hand side of the equation, switch the sides so it is on the left-hand side of the equation.
2l+2w=P

2l does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 2l from both sides.
2w=-2l+P

Divide each term in the equation by 2
w=-l+(P)/(2)