9a-20a=-11

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Solution for 9a-20a=-11 equation: 



9a-20a=-11

We move all terms to the left:

9a-20a-(-11)=0

We add all the numbers together, and all the variables

-11a+11=0

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

-11a=-11

a=-11/-11

a=1

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