9=3x+30

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Solution for 9=3x+30 equation: 



9=3x+30

We move all terms to the left:

9-(3x+30)=0

We get rid of parentheses

-3x-30+9=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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