19=a-1

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Solution for 19=a-1 equation: 



19=a-1

We move all terms to the left:

19-(a-1)=0

We get rid of parentheses

-a+1+19=0

We add all the numbers together, and all the variables

-1a+20=0

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

-a=-20

a=-20/-1

a=+20

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