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200/a=800
We move all terms to the left:
200/a-(800)=0
Domain of the equation: a!=0We multiply all the terms by the denominator
a∈R
-800*a+200=0
We add all the numbers together, and all the variables
-800a+200=0
We move all terms containing a to the left, all other terms to the right
-800a=-200
a=-200/-800
a=1/4
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