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36000-6x-x2=-x2-6x+36000
We move all terms to the left:
36000-6x-x2-(-x2-6x+36000)=0
We add all the numbers together, and all the variables
-(-1x^2-6x+36000)-6x-x2+36000=0
We add all the numbers together, and all the variables
-1x^2-(-1x^2-6x+36000)-6x+36000=0
We get rid of parentheses
-1x^2+1x^2+6x-6x-36000+36000=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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