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2x-(9-4x)=9
We move all terms to the left:
2x-(9-4x)-(9)=0
We add all the numbers together, and all the variables
2x-(-4x+9)-9=0
We get rid of parentheses
2x+4x-9-9=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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