-20a-19a=-13

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Solution for -20a-19a=-13 equation: 



-20a-19a=-13

We move all terms to the left:

-20a-19a-(-13)=0

We add all the numbers together, and all the variables

-39a+13=0

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

-39a=-13

a=-13/-39

a=1/3

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