6+7=55+2a

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Solution for 6+7=55+2a equation: 



6+7=55+2a

We move all terms to the left:

6+7-(55+2a)=0

We add all the numbers together, and all the variables

-(2a+55)+6+7=0

We add all the numbers together, and all the variables

-(2a+55)+13=0

We get rid of parentheses

-2a-55+13=0

We add all the numbers together, and all the variables

-2a-42=0

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

-2a=42

a=42/-2

a=-21

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