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x+x+39+6x+12=4109
We move all terms to the left:
x+x+39+6x+12-(4109)=0
We add all the numbers together, and all the variables
8x-4058=0
We move all terms containing x to the left, all other terms to the right
8x=4058
x=4058/8
x=507+1/4
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