a+40=2a

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Solution for a+40=2a equation: 



a+40=2a

We move all terms to the left:

a+40-(2a)=0

We add all the numbers together, and all the variables

-1a+40=0

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

-a=-40

a=-40/-1

a=+40

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