3a+a-20=8

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Solution for 3a+a-20=8 equation: 



3a+a-20=8

We move all terms to the left:

3a+a-20-(8)=0

We add all the numbers together, and all the variables

4a-28=0

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

4a=28

a=28/4

a=7

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