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(40000-4000)/4=x
We move all terms to the left:
(40000-4000)/4-(x)=0
We add all the numbers together, and all the variables
-x+36000/4=0
We add all the numbers together, and all the variables
-1x+9000=0
We move all terms containing x to the left, all other terms to the right
-x=-9000
x=-9000/-1
x=+9000
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