20-4a=-16

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Solution for 20-4a=-16 equation: 



20-4a=-16

We move all terms to the left:

20-4a-(-16)=0

We add all the numbers together, and all the variables

-4a+36=0

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

-4a=-36

a=-36/-4

a=+9

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