(3x-18)+(6x-18)=90

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Solution for (3x-18)+(6x-18)=90 equation: 



(3x-18)+(6x-18)=90

We move all terms to the left:

(3x-18)+(6x-18)-(90)=0

We get rid of parentheses

3x+6x-18-18-90=0

We add all the numbers together, and all the variables

9x-126=0

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

9x=126

x=126/9

x=14

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