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100x+(9000-100x)=9000
We move all terms to the left:
100x+(9000-100x)-(9000)=0
We add all the numbers together, and all the variables
100x+(-100x+9000)-9000=0
We get rid of parentheses
100x-100x+9000-9000=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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