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-3x-4(x-13)=129
We move all terms to the left:
-3x-4(x-13)-(129)=0
We multiply parentheses
-3x-4x+52-129=0
We add all the numbers together, and all the variables
-7x-77=0
We move all terms containing x to the left, all other terms to the right
-7x=77
x=77/-7
x=-11
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