x-(.1x)=8100

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Solution for x-(.1x)=8100 equation: 



x-(.1x)=8100

We move all terms to the left:

x-(.1x)-(8100)=0

We add all the numbers together, and all the variables

x-(+.1x)-8100=0

We get rid of parentheses

x-.1x-8100=0

We add all the numbers together, and all the variables

0.9x-8100=0

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

0.9x=8100

x=8100/0.9

x=9000

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