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2(4x+9)=12x+9-4x+9
We move all terms to the left:
2(4x+9)-(12x+9-4x+9)=0
We add all the numbers together, and all the variables
2(4x+9)-(8x+18)=0
We multiply parentheses
8x-(8x+18)+18=0
We get rid of parentheses
8x-8x-18+18=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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