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25=x/400
We move all terms to the left:
25-(x/400)=0
We add all the numbers together, and all the variables
-(+x/400)+25=0
We get rid of parentheses
-x/400+25=0
We multiply all the terms by the denominator
-x+25*400=0
We add all the numbers together, and all the variables
-1x+10000=0
We move all terms containing x to the left, all other terms to the right
-x=-10000
x=-10000/-1
x=+10000
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