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X=0.3X+300000
We move all terms to the left:
X-(0.3X+300000)=0
We get rid of parentheses
X-0.3X-300000=0
We add all the numbers together, and all the variables
0.7X-300000=0
We move all terms containing X to the left, all other terms to the right
0.7X=300000
X=300000/0.7
X=428571+0.30000000004657/0.7
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