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9=4x+x+9
We move all terms to the left:
9-(4x+x+9)=0
We add all the numbers together, and all the variables
-(5x+9)+9=0
We get rid of parentheses
-5x-9+9=0
We add all the numbers together, and all the variables
-5x=0
x=0/-5
x=0
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