a+42=3a

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Solution for a+42=3a equation: 



a+42=3a

We move all terms to the left:

a+42-(3a)=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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