PLEASE HELP ASAP How might the South respond to the 13th amendment list 2 ways

"The 13th Amendment to the U.S. Constitution, ratified in 1865 in the aftermath of the Civil War, abolished slavery in the United States. The 13th Amendment states: “Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.”

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the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69