20=6+7a

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Solution for 20=6+7a equation: 



20=6+7a

We move all terms to the left:

20-(6+7a)=0

We add all the numbers together, and all the variables

-(7a+6)+20=0

We get rid of parentheses

-7a-6+20=0

We add all the numbers together, and all the variables

-7a+14=0

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

-7a=-14

a=-14/-7

a=+2

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