a=2a-42

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Solution for a=2a-42 equation: 



a=2a-42

We move all terms to the left:

a-(2a-42)=0

We get rid of parentheses

a-2a+42=0

We add all the numbers together, and all the variables

-1a+42=0

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

-a=-42

a=-42/-1

a=+42

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