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3x+9=3x+9x
We move all terms to the left:
3x+9-(3x+9x)=0
We add all the numbers together, and all the variables
3x-(+12x)+9=0
We get rid of parentheses
3x-12x+9=0
We add all the numbers together, and all the variables
-9x+9=0
We move all terms containing x to the left, all other terms to the right
-9x=-9
x=-9/-9
x=1
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