L-7+2L-21+L=180

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Solution for L-7+2L-21+L=180 equation: 


Simplifying
L + -7 + 2L + -21 + L = 180

Reorder the terms:
-7 + -21 + L + 2L + L = 180

Combine like terms: -7 + -21 = -28
-28 + L + 2L + L = 180

Combine like terms: L + 2L = 3L
-28 + 3L + L = 180

Combine like terms: 3L + L = 4L
-28 + 4L = 180

Solving
-28 + 4L = 180

Solving for variable 'L'.

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

Add '28' to each side of the equation.
-28 + 28 + 4L = 180 + 28

Combine like terms: -28 + 28 = 0
0 + 4L = 180 + 28
4L = 180 + 28

Combine like terms: 180 + 28 = 208
4L = 208

Divide each side by '4'.
L = 52

Simplifying
L = 52

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