42=2(L)+2(W)

Solution for 42=2(L)+2(W) equation:

Simplifying
42 = 2(L) + 2(W)

Solving
42 = 2L + 2W

Solving for variable 'L'.

Move all terms containing L to the left, all other terms to the right.

Add '-2L' to each side of the equation.
42 + -2L = 2L + -2L + 2W

Combine like terms: 2L + -2L = 0
42 + -2L = 0 + 2W
42 + -2L = 2W

Add '-42' to each side of the equation.
42 + -42 + -2L = -42 + 2W

Combine like terms: 42 + -42 = 0
0 + -2L = -42 + 2W
-2L = -42 + 2W

Divide each side by '-2'.
L = 21 + -1W

Simplifying
L = 21 + -1W