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12(x+3000)=420000
We move all terms to the left:
12(x+3000)-(420000)=0
We multiply parentheses
12x+36000-420000=0
We add all the numbers together, and all the variables
12x-384000=0
We move all terms containing x to the left, all other terms to the right
12x=384000
x=384000/12
x=32000
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