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(40000-x)/4=9000
We move all terms to the left:
(40000-x)/4-(9000)=0
We add all the numbers together, and all the variables
(-1x+40000)/4-9000=0
We multiply all the terms by the denominator
(-1x+40000)-9000*4=0
We add all the numbers together, and all the variables
(-1x+40000)-36000=0
We get rid of parentheses
-1x+40000-36000=0
We add all the numbers together, and all the variables
-1x+4000=0
We move all terms containing x to the left, all other terms to the right
-x=-4000
x=-4000/-1
x=+4000
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