100=2x+7x

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Solution for 100=2x+7x equation: 



100=2x+7x

We move all terms to the left:

100-(2x+7x)=0

We add all the numbers together, and all the variables

-(+9x)+100=0

We get rid of parentheses

-9x+100=0

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

-9x=-100

x=-100/-9

x=11+1/9

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