9x-90=100-x

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Solution for 9x-90=100-x equation: 



9x-90=100-x

We move all terms to the left:

9x-90-(100-x)=0

We add all the numbers together, and all the variables

9x-(-1x+100)-90=0

We get rid of parentheses

9x+1x-100-90=0

We add all the numbers together, and all the variables

10x-190=0

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

10x=190

x=190/10

x=19

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