100=0.9x

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Solution for 100=0.9x equation: 



100=0.9x

We move all terms to the left:

100-(0.9x)=0

We add all the numbers together, and all the variables

-(+0.9x)+100=0

We get rid of parentheses

-0.9x+100=0

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

-0.9x=-100

x=-100/-0.9

x=111+0.099999999999994/0.9

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