20=2+2a

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Solution for 20=2+2a equation: 



20=2+2a

We move all terms to the left:

20-(2+2a)=0

We add all the numbers together, and all the variables

-(2a+2)+20=0

We get rid of parentheses

-2a-2+20=0

We add all the numbers together, and all the variables

-2a+18=0

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

-2a=-18

a=-18/-2

a=+9

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