x+(x-9)+(x-9-9)=180

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Solution for x+(x-9)+(x-9-9)=180 equation: 



x+(x-9)+(x-9-9)=180

We move all terms to the left:

x+(x-9)+(x-9-9)-(180)=0

We add all the numbers together, and all the variables

x+(x-9)+(x-18)-180=0

We get rid of parentheses

x+x+x-9-18-180=0

We add all the numbers together, and all the variables

3x-207=0

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

3x=207

x=207/3

x=69

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