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9-9=18x+13x=
We move all terms to the left:
9-9-(18x+13x)=0
We add all the numbers together, and all the variables
-(+31x)+9-9=0
We add all the numbers together, and all the variables
-(+31x)=0
We get rid of parentheses
-31x=0
x=0/-31
x=0
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