108=20-4a

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Solution for 108=20-4a equation: 



108=20-4a

We move all terms to the left:

108-(20-4a)=0

We add all the numbers together, and all the variables

-(-4a+20)+108=0

We get rid of parentheses

4a-20+108=0

We add all the numbers together, and all the variables

4a+88=0

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

4a=-88

a=-88/4

a=-22

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