A=1/2(2n)(n+5)

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Solution for A=1/2(2n)(n+5) equation: 



=1/2(2A)(A+5)

We move all terms to the left:

-(1/2(2A)(A+5))=0



Domain of the equation: 22A(A+5))!=0

A∈R



We multiply all the terms by the denominator


-(1=0

We add all the numbers together, and all the variables

=0

A=0/1

A=0

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