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x+3+x+6+x+9+x+12=34
We move all terms to the left:
x+3+x+6+x+9+x+12-(34)=0
We add all the numbers together, and all the variables
4x-4=0
We move all terms containing x to the left, all other terms to the right
4x=4
x=4/4
x=1
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