-19=a-20

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Solution for -19=a-20 equation: 



-19=a-20

We move all terms to the left:

-19-(a-20)=0

We get rid of parentheses

-a+20-19=0

We add all the numbers together, and all the variables

-1a+1=0

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

-a=-1

a=-1/-1

a=1

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