100=12.5a

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Solution for 100=12.5a equation: 



100=12.5a

We move all terms to the left:

100-(12.5a)=0

We add all the numbers together, and all the variables

-(+12.5a)+100=0

We get rid of parentheses

-12.5a+100=0

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

-12.5a=-100

a=-100/-12.5

a=+8

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