7a+3=a+81

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Solution for 7a+3=a+81 equation: 



7a+3=a+81

We move all terms to the left:

7a+3-(a+81)=0

We get rid of parentheses

7a-a-81+3=0

We add all the numbers together, and all the variables

6a-78=0

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

6a=78

a=78/6

a=13

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