17.5=a-3.5

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Solution for 17.5=a-3.5 equation: 



17.5=a-3.5

We move all terms to the left:

17.5-(a-3.5)=0

We get rid of parentheses

-a+3.5+17.5=0

We add all the numbers together, and all the variables

-1a+21=0

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

-a=-21

a=-21/-1

a=+21

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