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189=9000+x
We move all terms to the left:
189-(9000+x)=0
We add all the numbers together, and all the variables
-(x+9000)+189=0
We get rid of parentheses
-x-9000+189=0
We add all the numbers together, and all the variables
-1x-8811=0
We move all terms containing x to the left, all other terms to the right
-x=8811
x=8811/-1
x=-8811
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