-9a+2a-9a-20a=-16

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Solution for -9a+2a-9a-20a=-16 equation: 



-9a+2a-9a-20a=-16

We move all terms to the left:

-9a+2a-9a-20a-(-16)=0

We add all the numbers together, and all the variables

-36a+16=0

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

-36a=-16

a=-16/-36

a=4/9

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