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-x/25+13=21
We move all terms to the left:
-x/25+13-(21)=0
We add all the numbers together, and all the variables
-x/25-8=0
We multiply all the terms by the denominator
-x-8*25=0
We add all the numbers together, and all the variables
-1x-200=0
We move all terms containing x to the left, all other terms to the right
-x=200
x=200/-1
x=-200
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