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0.9x=x-300000
We move all terms to the left:
0.9x-(x-300000)=0
We get rid of parentheses
0.9x-x+300000=0
We add all the numbers together, and all the variables
-0.1x+300000=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-300000
x=-300000/-0.1
x=+3000000
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