(2s-9)+2s+(2s+9)=180

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Solution for (2s-9)+2s+(2s+9)=180 equation: 



(2s-9)+2s+(2s+9)=180

We move all terms to the left:

(2s-9)+2s+(2s+9)-(180)=0

We add all the numbers together, and all the variables

2s+(2s-9)+(2s+9)-180=0

We get rid of parentheses

2s+2s+2s-9+9-180=0

We add all the numbers together, and all the variables

6s-180=0

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

6s=180

s=180/6

s=30

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