2(L)+2(L-9)=66

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Solution for 2(L)+2(L-9)=66 equation: 


Simplifying
2(L) + 2(L + -9) = 66

Reorder the terms:
2L + 2(-9 + L) = 66
2L + (-9 * 2 + L * 2) = 66
2L + (-18 + 2L) = 66

Reorder the terms:
-18 + 2L + 2L = 66

Combine like terms: 2L + 2L = 4L
-18 + 4L = 66

Solving
-18 + 4L = 66

Solving for variable 'L'.

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

Add '18' to each side of the equation.
-18 + 18 + 4L = 66 + 18

Combine like terms: -18 + 18 = 0
0 + 4L = 66 + 18
4L = 66 + 18

Combine like terms: 66 + 18 = 84
4L = 84

Divide each side by '4'.
L = 21

Simplifying
L = 21

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