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-9=5x+7x-9
We move all terms to the left:
-9-(5x+7x-9)=0
We add all the numbers together, and all the variables
-(12x-9)-9=0
We get rid of parentheses
-12x+9-9=0
We add all the numbers together, and all the variables
-12x=0
x=0/-12
x=0
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