Solve for L
L=100
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2L+2L-80=320
Use the distributive property to multiply 2 by L-40.
4L-80=320
Combine 2L and 2L to get 4L.
4L=320+80
Add 80 to both sides.
4L=400
Add 320 and 80 to get 400.
L=\frac{400}{4}
Divide both sides by 4.
L=100
Divide 400 by 4 to get 100.
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