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30=9+6x
We move all terms to the left:
30-(9+6x)=0
We add all the numbers together, and all the variables
-(6x+9)+30=0
We get rid of parentheses
-6x-9+30=0
We add all the numbers together, and all the variables
-6x+21=0
We move all terms containing x to the left, all other terms to the right
-6x=-21
x=-21/-6
x=3+1/2
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