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-3x-9-7x=12+12x+23
We move all terms to the left:
-3x-9-7x-(12+12x+23)=0
We add all the numbers together, and all the variables
-3x-7x-(12x+35)-9=0
We add all the numbers together, and all the variables
-10x-(12x+35)-9=0
We get rid of parentheses
-10x-12x-35-9=0
We add all the numbers together, and all the variables
-22x-44=0
We move all terms containing x to the left, all other terms to the right
-22x=44
x=44/-22
x=-2
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