(3+6x)+(6x+3)=90

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Solution for (3+6x)+(6x+3)=90 equation: 



(3+6x)+(6x+3)=90

We move all terms to the left:

(3+6x)+(6x+3)-(90)=0

We add all the numbers together, and all the variables

(6x+3)+(6x+3)-90=0

We get rid of parentheses

6x+6x+3+3-90=0

We add all the numbers together, and all the variables

12x-84=0

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

12x=84

x=84/12

x=7

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