a+(a+1)+(a+2)=39

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Solution for a+(a+1)+(a+2)=39 equation: 



a+(a+1)+(a+2)=39

We move all terms to the left:

a+(a+1)+(a+2)-(39)=0

We get rid of parentheses

a+a+a+1+2-39=0

We add all the numbers together, and all the variables

3a-36=0

We move all terms containing a to the left, all other terms to the right

3a=36

a=36/3

a=12

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