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20x=12x+129000
We move all terms to the left:
20x-(12x+129000)=0
We get rid of parentheses
20x-12x-129000=0
We add all the numbers together, and all the variables
8x-129000=0
We move all terms containing x to the left, all other terms to the right
8x=129000
x=129000/8
x=16125
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