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40000=x+x-5000/2
We move all terms to the left:
40000-(x+x-5000/2)=0
We add all the numbers together, and all the variables
-(2x-2500)+40000=0
We get rid of parentheses
-2x+2500+40000=0
We add all the numbers together, and all the variables
-2x+42500=0
We move all terms containing x to the left, all other terms to the right
-2x=-42500
x=-42500/-2
x=+21250
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