56=2a+20

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Solution for 56=2a+20 equation: 



56=2a+20

We move all terms to the left:

56-(2a+20)=0

We get rid of parentheses

-2a-20+56=0

We add all the numbers together, and all the variables

-2a+36=0

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

-2a=-36

a=-36/-2

a=+18

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