4+a=2a

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Solution for 4+a=2a equation: 



4+a=2a

We move all terms to the left:

4+a-(2a)=0

We add all the numbers together, and all the variables

-1a+4=0

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

-a=-4

a=-4/-1

a=+4

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