A=100-9x

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Solution for A=100-9x equation: 



=100-9A

We move all terms to the left:

-(100-9A)=0

We add all the numbers together, and all the variables

-(-9A+100)=0

We get rid of parentheses

9A-100=0

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

9A=100

A=100/9

A=11+1/9

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