9=a+3.5

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Solution for 9=a+3.5 equation: 



9=a+3.5

We move all terms to the left:

9-(a+3.5)=0

We get rid of parentheses

-a-3.5+9=0

We add all the numbers together, and all the variables

-1a+5.5=0

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

-a=-5.5

a=-5.5/-1

a=5+0.5/1

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