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=1/2A(10+20)
We move all terms to the left:
-(1/2A(10+20))=0
Domain of the equation: 2A(10+20))!=0We add all the numbers together, and all the variables
A∈R
-(1/2A30)=0
We get rid of parentheses
-1/2A30=0
We multiply all the terms by the denominator
-1!=0
There is no solution for this equation
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