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-3x-5(-2x+9)=-129
We move all terms to the left:
-3x-5(-2x+9)-(-129)=0
We add all the numbers together, and all the variables
-3x-5(-2x+9)+129=0
We multiply parentheses
-3x+10x-45+129=0
We add all the numbers together, and all the variables
7x+84=0
We move all terms containing x to the left, all other terms to the right
7x=-84
x=-84/7
x=-12
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