a+a-13=a+42

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Solution for a+a-13=a+42 equation: 



a+a-13=a+42

We move all terms to the left:

a+a-13-(a+42)=0

We add all the numbers together, and all the variables

2a-(a+42)-13=0

We get rid of parentheses

2a-a-42-13=0

We add all the numbers together, and all the variables

a-55=0

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

a=55

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