3a+20=12a-16

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Solution for 3a+20=12a-16 equation: 



3a+20=12a-16

We move all terms to the left:

3a+20-(12a-16)=0

We get rid of parentheses

3a-12a+16+20=0

We add all the numbers together, and all the variables

-9a+36=0

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

-9a=-36

a=-36/-9

a=+4

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