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-3x-3x=42-6
We move all terms to the left:
-3x-3x-(42-6)=0
We add all the numbers together, and all the variables
-3x-3x-36=0
We add all the numbers together, and all the variables
-6x-36=0
We move all terms containing x to the left, all other terms to the right
-6x=36
x=36/-6
x=-6
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