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-8(-13x-40)=-408
We move all terms to the left:
-8(-13x-40)-(-408)=0
We add all the numbers together, and all the variables
-8(-13x-40)+408=0
We multiply parentheses
104x+320+408=0
We add all the numbers together, and all the variables
104x+728=0
We move all terms containing x to the left, all other terms to the right
104x=-728
x=-728/104
x=-7
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