2(l+l-6)=72

Solution for 2(l+l-6)=72 equation:

Simplifying
2(l + l + -6) = 72

Reorder the terms:
2(-6 + l + l) = 72

Combine like terms: l + l = 2l
2(-6 + 2l) = 72
(-6 * 2 + 2l * 2) = 72
(-12 + 4l) = 72

Solving
-12 + 4l = 72

Solving for variable 'l'.

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

Add '12' to each side of the equation.
-12 + 12 + 4l = 72 + 12

Combine like terms: -12 + 12 = 0
0 + 4l = 72 + 12
4l = 72 + 12

Combine like terms: 72 + 12 = 84
4l = 84

Divide each side by '4'.
l = 21

Simplifying
l = 21