100=680+3a

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Solution for 100=680+3a equation: 



100=680+3a

We move all terms to the left:

100-(680+3a)=0

We add all the numbers together, and all the variables

-(3a+680)+100=0

We get rid of parentheses

-3a-680+100=0

We add all the numbers together, and all the variables

-3a-580=0

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

-3a=580

a=580/-3

a=-193+1/3

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