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6x-4(5x+9)=-204
We move all terms to the left:
6x-4(5x+9)-(-204)=0
We add all the numbers together, and all the variables
6x-4(5x+9)+204=0
We multiply parentheses
6x-20x-36+204=0
We add all the numbers together, and all the variables
-14x+168=0
We move all terms containing x to the left, all other terms to the right
-14x=-168
x=-168/-14
x=+12
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