-19=2-7a

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Solution for -19=2-7a equation: 



-19=2-7a

We move all terms to the left:

-19-(2-7a)=0

We add all the numbers together, and all the variables

-(-7a+2)-19=0

We get rid of parentheses

7a-2-19=0

We add all the numbers together, and all the variables

7a-21=0

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

7a=21

a=21/7

a=3

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