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0=2x+6x+9
We move all terms to the left:
0-(2x+6x+9)=0
We add all the numbers together, and all the variables
-(8x+9)+0=0
We add all the numbers together, and all the variables
-(8x+9)=0
We get rid of parentheses
-8x-9=0
We move all terms containing x to the left, all other terms to the right
-8x=9
x=9/-8
x=-1+1/8
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