-1=0.5a+9

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Solution for -1=0.5a+9 equation: 



-1=0.5a+9

We move all terms to the left:

-1-(0.5a+9)=0

We get rid of parentheses

-0.5a-9-1=0

We add all the numbers together, and all the variables

-0.5a-10=0

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

-0.5a=10

a=10/-0.5

a=-20

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