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-13(-8x-9)=-819
We move all terms to the left:
-13(-8x-9)-(-819)=0
We add all the numbers together, and all the variables
-13(-8x-9)+819=0
We multiply parentheses
104x+117+819=0
We add all the numbers together, and all the variables
104x+936=0
We move all terms containing x to the left, all other terms to the right
104x=-936
x=-936/104
x=-9
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