a+a=20-2a

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Solution for a+a=20-2a equation: 



a+a=20-2a

We move all terms to the left:

a+a-(20-2a)=0

We add all the numbers together, and all the variables

a+a-(-2a+20)=0

We add all the numbers together, and all the variables

2a-(-2a+20)=0

We get rid of parentheses

2a+2a-20=0

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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