(9+7x)=30

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Solution for (9+7x)=30 equation: 



(9+7x)=30

We move all terms to the left:

(9+7x)-(30)=0

We add all the numbers together, and all the variables

(7x+9)-30=0

We get rid of parentheses

7x+9-30=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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