a-2(a-20)=3a

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Solution for a-2(a-20)=3a equation: 



a-2(a-20)=3a

We move all terms to the left:

a-2(a-20)-(3a)=0

We add all the numbers together, and all the variables

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

We multiply parentheses

-2a-2a+40=0

We add all the numbers together, and all the variables

-4a+40=0

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

-4a=-40

a=-40/-4

a=+10

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