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5=x/21000
We move all terms to the left:
5-(x/21000)=0
We add all the numbers together, and all the variables
-(+x/21000)+5=0
We get rid of parentheses
-x/21000+5=0
We multiply all the terms by the denominator
-x+5*21000=0
We add all the numbers together, and all the variables
-1x+105000=0
We move all terms containing x to the left, all other terms to the right
-x=-105000
x=-105000/-1
x=+105000
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