2a+81=a+85

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Solution for 2a+81=a+85 equation: 



2a+81=a+85

We move all terms to the left:

2a+81-(a+85)=0

We get rid of parentheses

2a-a-85+81=0

We add all the numbers together, and all the variables

a-4=0

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

a=4

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